linux-kernel - Re: [linux-usb-devel] 2.6.21-rc6 USB Keyboard hangs (EHCI/UHCI/HID)

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Date:	Mon, 9 Apr 2007 10:55:34 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Matthias Andree <matthias.andree@....de>
cc:	linux-kernel@...r.kernel.org,
	<linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] 2.6.21-rc6 USB Keyboard hangs (EHCI/UHCI/HID)

On Mon, 9 Apr 2007, Matthias Andree wrote:

> Please Cc: me on replies, as I read linux-kernel sporadically and am not
> subscribed to linux-usb-devel at all.
> 
> Greetings,
> 
> I have seen my USB keyboard drivers lock up several times now with my M$
> Natural Ergonomic Keyboard, both on SUSE 10.2's current kernel as well
> as 2.6.21-rc6 today. I don't ever recall this happen with older SUSE
> 10.0 kernels. The keyboard is connected to a USB2.0 hub with single
> transaction translator (at least that's what FreeBSD 6.2 says), which is
> connected to a via root hub.
> 
> Symptoms are that the keyboard LEDs go off and no further input is
> impossible (I'm typing this into a PS/2 keyboard). Replugging does not
> help. Trying to unload ehci-hcd hangs modprobe, and additionally I've
> got a stuck khubd (not sure if that's related), else no logging.
> 
> I'm rebuilding the kernel with HID/USB debugging cranked up to see if I
> can get some detail out of the situation. Any specific kernel debugging
> options that might help me debug this further?

It would help to see a trace from usbmon showing what happens during a 
lockup.  You can find the instructions in the kernel source file 
Documentation/usb/usbmon.txt.

To help keep the trace simple, try to avoid plugging any other USB devices
into that hub or any other high-speed USB devices into the computer.

Also, it might help to see a stack trace of khubd (Alt-SysRq-T) when it 
gets stuck.

Alan Stern

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