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

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/...C_5479.jpg

It does not help SysRq keys. Only I can force power off by hold power button.

Dmesg:
http://mrutecki.pl/download/kernel/....4-rc1.txt

Config:
http://mrutecki.pl/download/kernel/...-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.

Patch:
http://cgit.freedesktop.org/~danvet/drm-intel/commit/?h=drm-intel-fixes&idUa254ac63a3ac1867d1501030e7fba69c7d4aeb

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:
Mobile: +41 (0)79 365 57 48
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