linux-kernel - Re: 4.0.8->4.1.3 : after resume from s2ram both internal and external display of a docked ThinkPad ate black

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Message-ID: <20151029214933.GA18861@amd>
Date:	Thu, 29 Oct 2015 22:49:33 +0100
From:	Pavel Machek <pavel@....cz>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...hat.com>
Subject: Re: 4.0.8->4.1.3 : after resume from s2ram both internal and
 external display of a docked ThinkPad ate black

On Sun 2015-10-04 18:30:14, Toralf Förster wrote:
> 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@...hat.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@...hat.com>
> >     Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
> >     Cc: stable@...r.kernel.org
> >     Signed-off-by: Jani Nikula <jani.nikula@...el.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.

Yes. Now you ask Dave Airlie <airlied@...hat.com> to fix it. If that
does not work, you ask him to fix it, in less polite words. If that
does not work, you verify that reverting
e7d6f7d708290da1b7c92f533444b042c79412e0 fixes it for you, then ask
Daniel Vetter and Jani Nikula to revert it. If they fail to do that,
you go all the way up to Linus.

Good luck ;-), 
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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