Slackware 12 on the Asus 7K

This page is part of the TuxMobil and Linux on Laptops projects. You can find more information about running Linux on Asus laptops here and here.

Installing Slackware 12 on the Asus A7K

Last updated: 6 December 2007

(Pictures coming soon.)

The hardware

My A7K came configured with:

Hardware Components	Status under Slackware 12	Notes
AMD Turion 64 X2 TL-58 (dual core, 1.8 GHz, 1 MB total L2 cache)	Supported by vanilla i386 kernel	Needed to pass 'nosmp' and 'noapic' to 2.6.21.5 kernel; 'irqpoll' to 2.6.24-rc4.
DDR-667 RAM, came with a single 1 GB module installed in the inaccessible slot. I installed a second 1 GB module in the user-accessible slot for a total of 2GB.	Supported by vanilla i386 kernel	One memory slot (initially empty) is easily accessible behind a panel on the bottom of the laptop. The other is near the first but covered by the laptop body even when that panel is removed, so if the factory-installed module goes bad you're going to have to disassemble the whole case (and perhaps break a warranty seal?) to get at it. On the other hand, you don't have to pay extra to get your initial memory in a single module, as you do with some manufacturers.
ATI Mobile Radeon HD2600	Supported by the vesa and ati drivers from X.org	3D acceleration provided by the closed-source fglrx driver from ATI (even though the HD2600 is not yet listed in the product selection pane of ATI's main driver page. See configuration notes below.
17" WXGA+ (1440x900) display	Supported by X.org	I thought it was non-glossy when I ordered it, but it turned out to be glossy when it arrived. I'm still not completely sold on the idea, but didn't feel like returning the machine. The glare is minimal unless there's light falling directly on the panel, in which case it's pretty bad. The brightness is outstanding.
Realtek 8199SC gigabit Ethernet (RJ-45 interface)	Supported by the r8169 driver
JMicron 20363 SATA controller	Supported by the ahci driver
ATI SB600 PATA controller	Supported by the pata_atiixp driver
Hitachi HTS541616J9SA00 / SB40C70P SATA hard drive (UDMA 100, 160GB, 5400 rpm)	Autodetected and works, appears as /dev/sda	Requires 'lba32' option in LILO (now the default.) Delays bootup sequence with a long sequence of "Failed to IDENTIFY" errors in newer kernels unless the kernel parameter 'irqpoll' was passed
HL-DT-ST GSA-T20L DVD+/-RW and DVD-RAM drive (24x, UDMA 33)	Autodetected and works, bootable	CD/DVD writing not yet tested
Syntek AVStream webcam (USB 2.0, 1.3 megapixel)	Identified by lspci; no driver in standard kernel	Supports Video4Linux via the stk11xx driver
``CSIbetween'' Bluetooth interface	Supported by the bluetooth driver.
5 USB 2.0 ports	Supported by the ohci_hcd driver
One Firewire port	Supported by the ieee1394 (OHCI) driver.
Ricoh R5C822 flash card (SD/SDIO/MMC) reader	Supported by the ricoh_mmc and sdhci drivers
Ricoh R5C592 flash card (Memory Stick/xD) reader	Identified by lspci but not yet tested.
ATI SB600 Azalia audio controller (HDA)	Supported by ALSA via the snd_hda_intel driver. See configuration notes below.
Soft modem, driven by the SB600 Azalia chip	Not detected.	Reportedly supported by some hsfmodem/alsa/kernel combinations; haven't tested it myself.
i8042 serial controller	Detected as keyboard and four auxiliary serial devices	There are no physical serial ports on the machine (other than a mini-DIN connector for an external keyboard); I presume that these virtual ports are reserved for RS-232 emulation over USB. This chip may have something to do with the onboard modem but that's not immediately obvious.
HDMI output	Not tested
Touchpad	Detected and supported as a ps2 mouse by X.org
Five media player control buttons (Music, Prev, Next, Stop, Play/Pause) along the front edge	Generate normal key events seen by xev
Four special function buttons to the left of the keyboard	Not seen by xev	May be supported by the asus-laptop feature in newer kernels; not yet tested

This laptop worked under kernel version 2.6.21.5 (Slackware 12 default) when the nosmp and noapic options were passed to the bootloader. SMP is possible under 2.6.23 or 2.6.24-rc4 with the irqpoll option passed to the bootloader.

Slackware installation

The SMP-enabled huge.s kernel on the Slackware 12 installation disks froze during the boot sequence (sorry, don't remember where; I'll retest someday.) Rebooting and passing the option 'nosmp' at the boot parameters prompt allowed a clean boot. The default kernel supported almost all of the key hardware except wireless networking.

When I rebooted, the newly installed kernel (/boot/vmlinuz-huge-smp-2.6.21.5-smp) wouldn't boot until I added both 'nosmp' and 'noapic' as kernel parameters. I was finally able to get SMP activated with the 2.6.23 and 2.6.24-rc4 kernels (2.6.22 not tested), although these take a loooong time to boot due to SATA timeouts unless the kernel parameter 'irqpoll' is passed. I'm using 2.6.24-rc4 now; it boots quickly and seems perfectly stable with SMP, ACPI, and APIC when launched with the 'irqpoll' parameter (i.e. nosmp, noapic, acpi=noirq/off, etc. are NOT necessary.)

The hard drive was originally divided into four different Windows partitions, presumably to support hibernation, system recovery, etc. I replaced them with an 8GB swap partition (probably excessive, but make it at least twice as large as your RAM if you want to use Software Suspend) and Linux partitions as desired.

Drivers requiring manual installation

Wireless networking

The onboard 802.11b/g networking is provided by an Atheros 5007EG chipset (misidentified by lspci as a 5006EG.) The latest versions of madwifi support the 5006EG but not the 5007EG. A thread in the madwifi support database contains a patch that allegedly adds support for this chipset. Unfortunately, the patch had just been removed due to copyright uncertainty at the time I received the laptop, so I took another route (see below.) The patch has since been restored. Madwifi is probably the cleanest route to getting networking working, so you might wish to try the patch before any other method, but I have not yet tested it myself.

One alternative to the partially closed-source Madwifi driver is the new ath5k module, part of the Linux Wireless Compatibility project. Unfortunately, the installation process is considerably rougher around the edges than that of madwifi, and the patches cannot be applied to kernels earlier than 2.6.22 (Slackware 12 shipped with 2.6.21-5.) I wasn't able to get anything but an 'interface not ready' error with ath5k, but the driver is actively being developed and may have improved by the time you read this. UPDATE: the ath5k driver works perfectly starting with the 2.6.27 kernel series.

I originally settled for the ndiswrapper approach. Find a 32-bit Windows XP driver for the Atheros 5007EG (such as the ones here or here; if you need to peek inside InstallShield .cab files get an unpacking tool here), register it with 'ndiswrapper -i whatever.inf', and 'modprobe ndiswrapper' to initialize the interface. If you've already installed the madwifi or ath5k drivers, add the lines 'blacklist ath_pci' and 'blacklist ath5k' to the end of /etc/modprobe.d/blacklist to prevent them from being automatically loaded when the hardware is detected (ndiswrapper won't be.) All of these drivers support the standard wireless tools, so you should be able to enter your settings directly in /etc/rc.d/rc.inet1.conf and manage them with the iwconfig/iwspy/iwlist/etc. toolset.

Suspend/hibernate and resume

I'm using the Software Suspend 2 (``Tux on Ice'') driver available here. Suspending to RAM ('echo mem > /sys/power/state') works, but I haven't yet successfully resumed from hibernation to disk; I'll add some more information to this section when it's working.

Sound output

ALSA supports the card fairly well until you install alsa-driver 1.15 or newer or kernel 2.6.20 or newer. Once you cross either of those bridges, the driver continues to recognize and configure the card, but actual sound output is pretty dicey--- sometimes you can find a set of modprobe options that enable the speakers or the headphone jack, but usually not both, the quality is poor, and the required options are not consistent between kernel and driver versions or SMP/no-SMP configuration. Fortunately, there's finally a palatable solution: a talented hacker named dfm7a traced the bug to the auto-SPDIF detection on the line out port, and developed a workaround: install the hda-verb utility, and add the commands:

/usr/local/sbin/hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_MASK 3
/usr/local/sbin/hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DIRECTION 1
/usr/local/sbin/hda-verb /dev/snd/hwC0D0 0x01 SET_GPIO_DATA 1

to a startup file (e.g. rc.local or rc.alsa.) You shouldn't need anything at all in /etc/modprobe.conf or /etc/modprobe.d/sound; if you insist on trying to force the configuration I recommend

alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=auto
options snd-pcsp index=2

There's a proposed OSS4 patch here, but I haven't tested it yet.

3D acceleration and similar tricks

UPDATE: kernels 2.6.29 and newer break the fglrx kernel module, and due to license pissing contests I don't expect ATI to hurry to issue a fix. This thread contains a patch for one particular version of the driver, but the principle applies to any: threads can now posess more than one set of credentials, so current->euid needs to be changed to current->cred->euid; an explicit cast is required to modify the effective capabilities structure with cap_lower() or cap_raise(); you have to #include the driver/acpi/acpica configuration files from your kernel source to use the related headers; and modprobe will refuse to load the module without a force unless you pretend it's GPL.

I initially installed the '7-11' (8433) version (UPDATE: have now tested through version 9-7) of the fglrx driver from ATI. The Device section of my xorg.conf follows; the acceleration settings are pretty aggressive unless you're running Compiz:

Section "Device"
        Identifier  "HD2600-fglrx"
        Driver      "fglrx"
        VendorName  "ATI Technologies, Inc."
        BoardName   "Mobile Radeon HD2600"
        Option      "DRI"                    "true"
        Option      "ColorTiling"            "on"
        Option      "EnablePageFlip"         "true"
        Option      "AccelMethod"            "EXA"
        Option      "XAANoOffscreenPixmaps"
        Option      "RenderAccel"            "true"
        Option      "AllowGLXWithComposite"  "true"
        # Option      "AGPMode"                "x"
        # Option      "AGPFastWrite"           "on"
        Option      "VBERestore"             "true"
EndSection

By default, I was receiving GLX accleration only when the X session was owned by root; to provide 3D acceleration to all users add the section

Section "DRI"
  Mode 0666
EndSection

to the configuration file. To get the X Composite extension working, add the section

Section "Extensions"
  Option      "Composite"     "Enable"
EndSection

KDE 3.5, shipped with Slackware 12, already contains a compositing manager; you can enable it from the `Translucency' tab of the `Window Behavior' control panel (in Control Center.) There are some slight visual artifacts (e.g. when highlighting in Konsole) but overall it's a good experience. Of course, to really impress your friends you'll want to install Compiz. I installed the version 0.60/0.62 packages compiz-bcop, compiz-fusion, compiz-fusion-plugins-main, and compiz-fusion-plugins-extra from linuxpackages.net, and was then able to switch to Compiz with the script

#!/bin/sh

LIBGL_ALWAYS_INDIRECT=true compiz --replace ccp $* &
kde-window-decorator &

(To switch back to KDE, use 'kwin --replace &'.) Of course, to actually adjust your Compiz settings you'll want to install some more packages. To use a KDE-based tool, install libcompizconfig, compizconfig-backend-kconfig, and compizconfig-kconfig. If you use Gnome (easy to do in Slackware via dropline), install compizconfig-backend-gconf and compizconfig-gconf. There's a pretty good graphical configuration manager that can be installed with the packages ccsm, compizconfig-python, pygobject, pygtk, and pycairo. There's also a simple-ccsm package but I haven't tried it yet.

Webcam

The stk11xx project provides a low-level driver for the camera. You'll also need to enable Video4Linux 2 support (Video4Linux 1 compatibility is a good idea) in your kernel; stk11xx.ko depends on the videodev module from the standard kernel tree (drivers/media/video). You can capture video with xawtv or MPlayer, teleconference with Skype, etc. Sound capture is provided by ALSA; don't forget to adjust the microphone capture volume in alsamixer if it doesn't seem to be working.

Windows refund process

The laptop comes with Windows Vista Home Premium preinstalled. I'm in the process of trying to get a refund out of Asus right now; stay tuned. Sadly, I couldn't find accounts on the internet of anyone who's successfully wrung a refund out of them in the past.

Detailed system statistics


lspci -vv
---------
00:00.0 Host bridge: ATI Technologies Inc Unknown device 7910
	Subsystem: ATI Technologies Inc Unknown device 7910
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- TAbort- Reset- FastB2B-
	Capabilities: 

00:04.0 PCI bridge: ATI Technologies Inc Unknown device 7914 (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- Reset- FastB2B-
	Capabilities: 

00:05.0 PCI bridge: ATI Technologies Inc Unknown device 7915 (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- Reset- FastB2B-
	Capabilities: 

00:06.0 PCI bridge: ATI Technologies Inc Unknown device 7916 (prog-if 00 [Normal decode])
	Control: I/O- Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- Reset- FastB2B-
	Capabilities: 

00:07.0 PCI bridge: ATI Technologies Inc Unknown device 7917 (prog-if 00 [Normal decode])
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- Reset- FastB2B-
	Capabilities: 

00:12.0 SATA controller: ATI Technologies Inc SB600 Non-Raid-5 SATA (prog-if 01 [AHCI 1.0])
	Subsystem: ASUSTeK Computer Inc. Unknown device 14f7
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- 

00:13.0 USB Controller: ATI Technologies Inc SB600 USB (OHCI0) (prog-if 10 [OHCI])
	Subsystem: ASUSTeK Computer Inc. Unknown device 14f7
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- 

00:14.0 SMBus: ATI Technologies Inc SB600 SMBus (rev 14)
	Subsystem: ASUSTeK Computer Inc. Unknown device 14f7
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- 

00:14.1 IDE interface: ATI Technologies Inc SB600 IDE (prog-if 8a [Master SecP PriP])
	Subsystem: ASUSTeK Computer Inc. Unknown device 14f7
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- 

00:14.3 ISA bridge: ATI Technologies Inc SB600 PCI to LPC Bridge
	Subsystem: ASUSTeK Computer Inc. Unknown device 14f7
	Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- TAbort- Reset- FastB2B-

00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
	Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 

00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
	Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- TAbort- SERR- TAbort- SERR- 

01:00.0 VGA compatible controller: ATI Technologies Inc Unknown device 9581 (prog-if 00 [VGA])
	Subsystem: ASUSTeK Computer Inc. Unknown device 1562
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 

01:00.1 Audio device: ATI Technologies Inc Unknown device aa08
	Subsystem: ATI Technologies Inc Unknown device aa08
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 

05:00.0 SATA controller: JMicron Technologies, Inc. JMicron 20360/20363 AHCI Controller (rev 02) (prog-if 01 [AHCI 1.0])
	Subsystem: ASUSTeK Computer Inc. Unknown device 1348
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 

07:00.0 Ethernet controller: Atheros Communications, Inc. AR5006EG 802.11 b/g Wireless PCI Express Adapter (rev 01)
	Subsystem: Unknown device 1a3b:1026
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 

08:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05) (prog-if 10 [OHCI])
	Subsystem: ASUSTeK Computer Inc. Unknown device 1567
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- 

08:01.1 Generic system peripheral [0805]: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)
	Subsystem: ASUSTeK Computer Inc. Unknown device 1567
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- 

08:01.2 System peripheral: Ricoh Co Ltd Unknown device 0843 (rev 12)
	Subsystem: ASUSTeK Computer Inc. Unknown device 1567
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- 

08:01.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 12)
	Subsystem: ASUSTeK Computer Inc. Unknown device 1567
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- 

08:01.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev ff) (prog-if ff)
	!!! Unknown header type 7f

08:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet (rev 10)
	Subsystem: ASUSTeK Computer Inc. Unknown device 1345
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- 


lsusb -v
--------
Bus 6 Device 3: ID 174f:a311  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x174f 
  idProduct          0xa311 
  bcdDevice            0.05
  iManufacturer           1 
  iProduct                2 
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          147
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0300  1x 768 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       2
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x03fc  1x 1020 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       3
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0400  1x 0 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       4
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0c00  2x 0 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       5
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval               5
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x1400  3x 0 bytes
        bInterval               1
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0002
  (Bus Powered)
  Remote Wakeup Enabled

Bus 6 Device 1: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         1 Single TT
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.24-rc4-smp ehci_hcd
  iProduct                2 EHCI Host Controller
  iSerial                 1 0000:00:13.5
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval              12
Hub Descriptor:
  bLength              11
  bDescriptorType      41
  nNbrPorts            10
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
    TT think time 8 FS bits
  bPwrOn2PwrGood       10 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00 0x00
  PortPwrCtrlMask    0xff 0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
   Port 3: 0000.0100 power
   Port 4: 0000.0100 power
   Port 5: 0000.0100 power
   Port 6: 0000.0100 power
   Port 7: 0000.0503 highspeed power enable connect
   Port 8: 0000.0100 power
   Port 9: 0000.0100 power
   Port 10: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 5 Device 1: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed (or root) hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.24-rc4-smp ohci_hcd
  iProduct                2 OHCI Host Controller
  iSerial                 1 0000:00:13.4
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x0012
    No power switching (usb 1.0)
    No overcurrent protection
  bPwrOn2PwrGood        2 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 4 Device 1: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed (or root) hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.24-rc4-smp ohci_hcd
  iProduct                2 OHCI Host Controller
  iSerial                 1 0000:00:13.3
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x0012
    No power switching (usb 1.0)
    No overcurrent protection
  bPwrOn2PwrGood        2 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 3 Device 4: ID 0b05:1712 ASUSTek Computer, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          224 Wireless
  bDeviceSubClass         1 Radio Frequency
  bDeviceProtocol         1 Bluetooth
  bMaxPacketSize0        64
  idVendor           0x0b05 ASUSTek Computer, Inc.
  idProduct          0x1712 
  bcdDevice           19.15
  iManufacturer           0 
  iProduct                0 
  iSerial                 3 0194E8-5B-0002
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          193
    bNumInterfaces          3
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0009  1x 9 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0009  1x 9 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       2
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0011  1x 17 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0011  1x 17 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       3
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0019  1x 25 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0019  1x 25 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       4
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0021  1x 33 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0021  1x 33 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       5
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0031  1x 49 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0031  1x 49 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       254 Application Specific Interface
      bInterfaceSubClass      1 Device Firmware Update
      bInterfaceProtocol      0 
      iInterface              0 
Device Status:     0x0001
  Self Powered

Bus 3 Device 1: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed (or root) hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.24-rc4-smp ohci_hcd
  iProduct                2 OHCI Host Controller
  iSerial                 1 0000:00:13.2
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x0012
    No power switching (usb 1.0)
    No overcurrent protection
  bPwrOn2PwrGood        2 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0103 power enable connect
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 2 Device 1: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed (or root) hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.24-rc4-smp ohci_hcd
  iProduct                2 OHCI Host Controller
  iSerial                 1 0000:00:13.1
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x0012
    No power switching (usb 1.0)
    No overcurrent protection
  bPwrOn2PwrGood        2 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 1 Device 1: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed (or root) hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.24-rc4-smp ohci_hcd
  iProduct                2 OHCI Host Controller
  iSerial                 1 0000:00:13.0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed (or root) hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x0012
    No power switching (usb 1.0)
    No overcurrent protection
  bPwrOn2PwrGood        2 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled