[3.4-rc1][Regression][intel] Resume from suspend to disk hangs on restoring backlight state

[Maciej Rutecki]

On poniedziałek, 2 kwietnia 2012 o 19:54:02 Daniel Vetter wrote:
> On Mon, Apr 02, 2012 at 07:39:39PM +0200, Maciej Rutecki wrote:
> > Last known good: 3.3
> > Bad kernel: 3.4-rc1
> > Subsystem: power management/suspend/dri(intel)
> > 
> > When I resume from suspend to disk then system hangs on this screen:
> > http://mrutecki.pl/download/kernel/3.4-rc1/suspend_resume/DSC_5479.jpg
> > 
> > It does not help SysRq keys. Only I can force power off by hold power
> > button.
> > 
> > Dmesg:
> > http://mrutecki.pl/download/kernel/3.4-rc1/suspend_resume/dmesg-3.4-rc1.t
> > xt
> > 
> > Config:
> > http://mrutecki.pl/download/kernel/3.4-rc1/suspend_resume/config-3.4.0-rc
> > 1
> 
> Likely a known regression, ppgtt support broke hibernate because my code
> doesn't restore the ppgtt page directory correctly in the thaw function.
> 
> Patch:
> http://cgit.freedesktop.org/~danvet/drm-intel/commit/?h=drm-intel-fixes&id=
> 55a254ac63a3ac1867d1501030e7fba69c7d4aeb
> 
> Please test whether this fixes your issue. You can also try adding
> i915.i915_enable_ppgtt=0 to your kernel cmdline.
> 
> Thanks, Daniel

Patch solves problem.

Now resume hangs later on another subsystem: wireless :D

Regards
-- 
Maciej Rutecki
http://www.mrutecki.pl