linux-kernel - Re: broken access to a USB HID device after suspend

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Message-ID: <20080312224411.GB2290@dose.home.local>
Date:	Wed, 12 Mar 2008 23:44:11 +0100
From:	Tino Keitel <tino.keitel@....de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: broken access to a USB HID device after suspend

On Wed, Mar 12, 2008 at 17:44:56 -0400, Alan Stern wrote:

[...]

> Tino, it would help to see a kernel log showing what happened during 
> the suspend, resume, and failure of hidmon.  It would help even more if 
> you test under a kernel with CONFIG_USB_DEBUG enabled.

A full kernel log is available at http://tikei.de/dmesg

> 
> Even if you can't reproduce the problem, do you have the complete 
> kernel log from before?
> 
> Is it possible that this is really a problem with the LCD device, not 
> with the kernel?  I ask because if the device was working properly then 
> unplugging and replugging the USB cable should do a complete reset.

I did the following:

- suspended the computer

- switched off the LCD

- resumed the computer

- tried to use hidmon, got the error

- unplugged the LCD

- plugged in the LCD

- tried to use hidmon again, got the error again

- suspended the computer

- resumed the computer

- tried to use hidmon again, and it worked

Note that I didn't switch off the LCD during the second suspend, in the
case that matters.

Regards,
Tino
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