linux-kernel - Re: webcam problem after suspend/hibernate

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Message-ID: <87aatn9k7j.fsf@old-tantale.fifi.org>
Date:	01 Apr 2010 10:05:52 -0700
From:	Philippe Troin <phil@...i.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Mohamed Ikbel Boulabiar <boulabiar@...il.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: webcam problem after suspend/hibernate

Pavel Machek <pavel@....cz> writes:

> > Do you mean the dmesg output ?
> > A full dmesg is included in this address :
> > http://pastebin.com/8XU619Uk
> > Not in all suspend/hibernate the problem comes, only in some of them
> > and this included dmesg output is just after a non working case of
> > webcam fault.
> > 
> > 
> > I also have found this in `/var/log/messages | grep uvcvideo`
> > Mar 31 00:31:16 linux-l365 kernel: [399905.714743] usbcore:
> > deregistering interface driver uvcvideo
> > Mar 31 00:31:24 linux-l365 kernel: [399914.121386] uvcvideo: Found UVC
> > 1.00 device LG Webcam (0c45:62c0)
> > Mar 31 00:31:24 linux-l365 kernel: [399914.135661] usbcore: registered
> > new interface driver uvcvideo
> 
> Also try unloading uvcvideo before suspend and reloading it after
> resume...

I have a similar problem with a Creative Optia webcam.

I have found that removing the ehci_hcd module and reinserting it
fixes the problem.

If your kernel ships with ehci_hcd built-in (F11 and later), the
script included also fixes the problem (it rebind the device).

Of course, I'd love to see this issue fixed.

Phil.

Script: /etc/pm/sleep.d/50kickuvc

#!/bin/sh

case "$1" in
  resume|thaw)
    cd /sys/bus/usb/drivers/uvcvideo || exit 1
    devices=''
    for i in [0-9]*-[0-9]*:*
    do
      [ -L "$i" ] || break
      saved_IFS="$IFS"
      IFS=:
      set -- $i
      IFS="$saved_IFS"
      found=no
      for j in $devices
      do
        if [ "$j" = "$1" ]
        then
          found=yes
        fi
      done
      if [ "$found" = no ]
      then
        devices="$devices $1"
      fi
    done
    if [ "$devices" != "" ]
    then
      cd /sys/bus/usb/drivers/usb || exit 1
      for i in $devices
      do
        echo $i > unbind
        sleep 1
        echo $i > bind
      done
    fi
    ;;
esac
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