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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Date:	Sat, 15 Aug 2015 15:32:39 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Pavel Machek <pavel@....cz>
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 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
> 


FWIW the issue happens only if the system is docked.

Plugging in the VGA connector in parallel to the already plugged in DVI-D conenctor after wakeup from s2ram helps as a work around.
In this case then the external monitor shows again the KDE desktop.

After few seconds I can then plug off the VGA connector from the docking station and can continue with my work.


-- 
Toralf, pgp key: 872AE508 0076E94E
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