Bug#439744: reversion in Legacy Backlight Brightness support
Joey Hess wrote:
> Package: xserver-xorg-video-intel
> Version: 2:2.1.1-1
> Severity: normal
>
> My Fujitsu P7120 laptop got working backlight brightness control with
> commit a67c2965385001bcb8987265f698ff0f5809cd11 or thereabouts. This
> laptop uses 'legacy' mode for the backlight control. If I use version
> 2:2.1.0-2 of the package, currently in testing, the brightness control
> works perfectly. If I upgrade to 2:2.1.1-1, the brightness control
> breaks.
>
> With the broken version, xbacklight does still do something, but it
> seems that its scale 0..100 is not a linear gradient any more. For
> example, setting it to 10 yeilds about 100% brightness. 20 is about 20%.
> 22 is back to 100%. If xbacklight is allowed to do "smooth" scaling, what
> really happens is an epilepsy-inducing flicker.
>
A different backlight regression has been reported in 2.1.1
https://bugs.freedesktop.org/show_bug.cgi?id=11527
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=438969
Could you try reverting the following commit from driver 2.1.1 ?
http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-intel.git;a=commitdiff;h=a85dd7adc35601a988b1001e8b3c8aa4d53de0c0;hp=c989cb4897e2e2d395c52df4822290a767cdc866
Also, testing the latest upstream git master might be good. Note that
the commit to revert would be 0da4f2b0cd7203377ad10407928a367b8c6d310e
there.
Thanks,
Brice
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