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

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Date:	Mon, 2 May 2011 18:29:06 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Adi J. Sieker" <adi@...ker.io>, Jiri Kosina <jkosina@...e.cz>
cc:	Oliver Neukum <oliver@...kum.org>,
	USB list <linux-usb@...r.kernel.org>,
	<linux-input@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: USB keyboard recognized as HID keyboard but doesn't work

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

> > 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

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