linux-kernel - Re: USB keyboard recognized as HID keyboard but doesn't work

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Date:	Mon, 02 May 2011 23:19:18 +0200
From:	"Adi J. Sieker" <adi@...ker.io>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Oliver Neukum <oliver@...kum.org>,
	USB list <linux-usb@...r.kernel.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: USB keyboard recognized as HID keyboard but doesn't work

On 02/05/11 23:06, Alan Stern wrote:
> On Mon, 2 May 2011, Adi J. Sieker wrote:
>
>> Attached is the usbmon trace when I plug the keyboard in.
>>
>> lsusb shows the keyboard as:
>> Bus 002 Device 008: ID 060b:0230 Solid Year
>>
>> Relevant section from /sys/kernel/debug/usb/devices
>> T:  Bus=02 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#=  8 Spd=1.5 MxCh= 0
>> D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
>> P:  Vendor=060b ProdID=0230 Rev= 2.20
>> S:  Manufacturer=KB
>> S:  Product=USB Keyboard
>> C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA
>> I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=01 Driver=usbhid
>> E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
>> I:* If#= 1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
>> E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=10ms
>
> Interestingly, the usbmon trace shows that the interrupt endpoint for
> interface 1 isn't being used by usbhid.  I don't know why, but it
> shouldn't make much difference for your purposes since that interface
> appears to be associated with the gaming interface.  But maybe I'm
> wrong and it is important somehow...
>
> The other noticeable thing is that the keyboard didn't accept the
> Set-Idle request for interface 1.
>
> You said before that the keyboard worked okay when driven by a guest
> Windows OS, right?  Can you collect an equivalent usbmon trace for
> that?  Comparing the two traces may be instructive.

I hope this is what you meant. :)
Attached is a usbmon trace when I attach the keyboard to a VBox VM 
running a Windows XP guest. I have no idea how to get a USB trace from 
within Windows. The last block is when I pressed h twice in the Windows 
XP guest.

Cheers
    Adi

View attachment "usbmon-guest.out" of type "text/plain" (4577 bytes)