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

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Message-ID: <20080312223325.GA2290@dose.home.local>
Date:	Wed, 12 Mar 2008 23:33:25 +0100
From:	Tino Keitel <tino.keitel@....de>
To:	linux-kernel@...r.kernel.org
Subject: Re: broken access to a USB HID device after suspend

On Wed, Mar 12, 2008 at 22:23:46 +0100, Jiri Kosina wrote:
> On Wed, 12 Mar 2008, Tino Keitel wrote:
> 
> > 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.
> 
> This in fact looks like a problem with usbdevfs and/or libusb library, not 
> the in-kernel HID drvier.
> 
> Did this work before? In 2.6.24? 2.6.23? Alan (added to CC, as well as USB 

It worked in 2.6.24 and several 2.6.25-rc kernels, including the
currently running 2.6.25-rc5.

Regards,
Tino
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