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

On Mon, 2 May 2011, Adi J. Sieker wrote:

quoted

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.

This is perfect.  It shows that the H key is reported using the 
interrupt endpoint on interface 1, which explains why it's not working 
with usbhid.  It also shows that the rejected Set-Idle request doesn't 
matter.

At this point I don't know what the problem is, but now there's plenty 
of information in the email thread for the people on linux-input to 
debug this.

Alan Stern