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

Daniel Vetter daniel at ffwll.ch
Mon Apr 2 10:54:02 PDT 2012

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.txt
> Config:
> http://mrutecki.pl/download/kernel/3.4-rc1/suspend_resume/config-3.4.0-rc1

Likely a known regression, ppgtt support broke hibernate because my code
doesn't restore the ppgtt page directory correctly in the thaw function.


Please test whether this fixes your issue. You can also try adding
i915.i915_enable_ppgtt=0 to your kernel cmdline.

Thanks, Daniel
Daniel Vetter
Mail: daniel at ffwll.ch
Mobile: +41 (0)79 365 57 48

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