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    SubjectRe: [3.4-rc1][Regression][intel] Resume from suspend to disk hangs on restoring backlight state
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    On poniedziałek, 2 kwietnia 2012 o 21:05:23 Daniel Vetter wrote:
    > On Mon, Apr 02, 2012 at 09:00:11PM +0200, Maciej Rutecki wrote:
    > > 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.jp
    > > > > g
    > > > >
    > > > > 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-r
    > > > > c1.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
    >
    > Woot, I'm off the hook ;-) Thanks for reporting this issue and testing the
    > patch.
    >
    > Yours, Daniel

    Seems be resolved in -rc2.

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