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

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Message-ID: <20080312193405.GA23209@dose.home.local>
Date:	Wed, 12 Mar 2008 20:34:05 +0100
From:	Tino Keitel <tino.keitel@....de>
To:	linux-kernel@...r.kernel.org
Subject: broken access to a USB HID device after suspend

Hi,

I use a tool called hidmon to control the parameters of my LCD in shell
scripts. I just had the case where this tool didn't work after suspend
to RAM. I just got this error message:

hid_force_open failed with return code 13

The kernel log contains lines like this:

usb 1-1.3: usbfs: USBDEVFS_CONTROL failed cmd hidmon rqt 129 rq 6 len 9 ret -110

Unplugging and replugging the USB cable of the LCD didn't work.
However, after a further suspend/resume cycle it works.

This is Linux 2.6.25-rc5. The behaviour is not repoducible, though.
However, I just mention it for the case that this might ring a bell
somewhere.

Regards,
Tino
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