[Bug 76152] [IVB/HSW/BDW bisected]WARNING: CPU: 3 PID: 4178 at drivers/gpu/drm/i915/intel_pm.c:5570 check_power_well_state+0x69/0x6f [i915]() after resume form S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76152

Imre Deak <imre.deak at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #95803|0                           |1
        is obsolete|                            |

--- Comment #5 from Imre Deak <imre.deak at gmail.com> ---
Created attachment 96038
  --> https://bugs.freedesktop.org/attachment.cgi?id=96038&action=edit
move the i915 resume handling before audio resume

(In reply to comment #4)
> Created attachment 95912 [details]
> dmesg
> 
> The patch unable to boot, there shows many Call Trace errors during booting.
> please check the attached dmesg for details. thanks.

That was due to another bug fixed now by:

commit 05efeebd2838f0dedf765179244a7fb543fdca8a
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Mar 18 16:26:25 2014 +0100

    drm/i915: Fix up the forcewake timer initialization

I also found that the fix I attached didn't do a proper resume of the i915
device, it left the pci device itself disabled.

I attached a new fix and it should get rid of the warning in this bug report.
Could you give it a try? Note that there can be other independent warnings that
you see even after applying this patch. The ones you see both before and after
the fix is applied should be handled separately from this bugzilla ticket.

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