Bug#499449: linux-image-2.6.26-1-amd64: Setting backlight brightness does not work after resume from suspend

[Moritz Muehlenhoff <jmm@inutil.org>]

tags 499449 moreinfo
thanks

On Thu, Sep 18, 2008 at 09:40:50PM +0200, jochem wrote:
> Package: linux-image-2.6.26-1-amd64
> Version: 2.6.26-4
> Severity: normal
> 
> In lenny, setting the brightness of the backlight of my sony vaio worked
> out of the box (wow!). However after a resume from suspend to ram (which
> also worked out of the box, wow!), this does not work anymore, the
> display is restored to full brightness and the user is unable to dim it
> again.
> 
> No kernel modules, acpi-settings, suspend settings, etc. not altered from a
> default lenny beta 2 installer-install.
> 
> To reproduce, before suspend 
> 
> echo 10 > /sys/class/backlight/sony/brigtness 
> Screen gets bright
> echo 1 > /sys/class/backlight/sony/brigtness 
> Screen gets dark
> 
> After resuming from suspend
> 
> echo 10 > /sys/class/backlight/sony/brigtness 
> Nothing happens
> echo 1 > /sys/class/backlight/sony/brigtness 
> Nothing happens

Hi,
The next release of Debian (6.0, code name Squeeze) will be based
on 2.6.32. Please test the current 2.6.32 from unstable/testing and tell
us whether the problem persists. If so, we should report it upstream
to the kernel.org developers.

The 2.6.32 kernel is available from packages.debian.org and can
be installed in both Debian stable, testing and unstable
installations.

Thanks,
        Moritz