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List:       kde-bugs-dist
Subject:    [kwin] [Bug 344326] Black or corrupted screen on resume from suspend
From:       JS Gibson via KDE Bugzilla <bugzilla_noreply () kde ! org>
Date:       2016-04-06 0:13:26
Message-ID: bug-344326-17878-bobe1GLWnI () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=344326

JS Gibson <jgibson706@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jgibson706@gmail.com

--- Comment #101 from JS Gibson <jgibson706@gmail.com> ---
(In reply to Ruslan Kabatsayev from comment #0)
> Often after I suspend my machine, wait some time and resume back, I see
> sometimes black, other times corrupted screen with blinking triangles of
> distorted windows content. This happens on at least two machines I'm working
> on, both with nvidia video cards (one Quadro (can't tell details yet),
> another GeForce GTX 750 Ti with binary driver 340.46), both machines running
> 64 bit kernel.
> 
> This is a regression, and I've run git-bisect to find that the bad commit is
> commit 1f0bb6d36075b0b14c927b91d5c3df6720826afd
> Author: Fredrik Höglund <fredrik@kde.org>
> Date:   Thu Mar 21 23:52:03 2013 +0100
> 
>     kwin: Use the new API for rendering quads
> 
> This bug sometimes doesn't reproduce, so I can only be _almost_ sure that
> previous versions don't have it. But I've tested kwin version right before
> this commit, at f709af7c7e23010293c8eb9fa67871adfdb75207, and haven't seen
> any problems for several days, so I think the above bad commit should be the
> right one.
> 
> Reproducible: Sometimes
> 
> Steps to Reproduce:
> 1. Run kwin with OpenGL compositing on an nvidia card with binary driver
> 2. Suspend to RAM
> 3. Wait several minutes (sometimes needs hours, don't know what triggers it)
> 4. Resume
> 
> Actual Results:  
> Screen is garbled with flickering triangles textured with parts of desktop
> content, or sometimes screen is just black
> 
> Expected Results:  
> Desktop should render normally
> 
> Toggling compositing off and on by double pressing Alt+Shift+F12 fixes the
> screen and lets me work normally until next suspend/resume cycle.

The same thing also happens whenever I change resolutions. If I have a game
start up in a lower res, and then change it, it also happens. I was wondering
if you have multiple monitors. I have a laptop set up with an external monitor
that I run with the lid closed. The machine always goes to  the laptop monitor
(1920x1080) when KDE starts (gonna be researching this bug next). After
entering the password (have to do it blind) it will change over to the external
(1920x1200) monitor. I was thinking it was the resolution change as it doesn't
happen when I boot up without the external monitor.

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