On 08/04/2015 02:29 PM, Toralf Förster wrote:
> On 08/02/2015 09:43 AM, Pavel Machek wrote:
>> Any chance to bisect it?
> Did it.
> 
> FWIW: the mentioned commit was introduced between 3.18 and 3.19.
> But my system (hardened 64 bit Gentoo) did not suffer from it till version 4.0.8.
> The hardened kernel 4.1.x was the first where the bug was visible at my docked environment  too.
> 
> 
> 
> commit e7d6f7d708290da1b7c92f533444b042c79412e0
> Author: Dave Airlie <airlied@redhat.com>
> Date:   Mon Dec 8 13:23:37 2014 +1000
> 
>     drm/i915: resume MST after reading back hw state
> 
>     Otherwise the MST resume paths can hit DPMS paths
>     which hit state checker paths, which hit WARN_ON,
>     because the state checker is inconsistent with the
>     hw.
> 
>     This fixes a bunch of WARN_ON's on resume after
>     undocking.
> 
>     Signed-off-by: Dave Airlie <airlied@redhat.com>
>     Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>     Cc: stable@vger.kernel.org
>     Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> 

Is there anything else what I can do ?

Current kernels up to 4.2.3 and 4.3-rc3 (not hardened) shows this issue here at my system.


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