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List:       kde-bugs-dist
Subject:    [kwin] [Bug 323688] Slide effect flicker after change to OpenGL 2.0 in desktop effects.
From:       <a.skembris () gmail ! com>
Date:       2013-08-20 0:27:42
Message-ID: bug-323688-17878-y72AsBoHGP () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=323688

--- Comment #9 from a.skembris@gmail.com ---
You are on to something with the second display suggestion. Disconnecting the
second display makes the problem go away! Therefore, before proceeding with
installing fglrx, I tried a few things.

First, desktop effects are really smooth if I choose "Raster" as the Qt
graphics system, so that's solved. 

I guess it is a Xinerama related issue, so I figure at this point a bit more
info on the displays is warranted. My main screen is a Samsung 2223Nw, not
rotated, max resolution 1680x1050. The other one is a LG Flatron L1932P, max
resolution 1280x1024. The second one is rotated by 90 degrees and offset so
that its top left corner lines up with the bottom right corner of the first
one. This is the output of xrandr:

Screen 0: minimum 320 x 200, current 2704 x 1280, maximum 8192 x 8192
DVI-0 connected primary 1680x1050+0+230 (normal left inverted right x axis y
axis) 474mm x 296mm
   1680x1050      60.0*+
   1680x945       60.0  
   1400x1050      60.0  
   1600x900       60.0  
   1280x1024      75.0     60.0  
   1440x900       75.0     59.9  
   1280x960       60.0  
   1366x768       60.0  
   1360x768       60.0  
   1280x800       74.9     59.8  
   1152x864       75.0  
   1280x768       74.9     59.9  
   1024x768       75.1     70.1     60.0  
   1024x576       60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   848x480        60.0  
   640x480        72.8     75.0     66.7     60.0  
   720x400        70.1  
DIN disconnected (normal left inverted right x axis y axis)
DVI-1 connected 1024x1280+1680+0 left (normal left inverted right x axis y
axis) 376mm x 301mm
   1280x1024      60.0*+
   1280x960       60.0  
   1280x800       74.9     59.9  
   1152x864       75.0  
   1280x768       74.9     60.0  
   1024x768       75.1     75.0     70.1     60.0  
   1024x576       60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   848x480        60.0  
   640x480        72.8     75.0     60.0  
   720x400        70.1  


I have tried the following: shut down, disconnect the second screen, boot into
KDE, shut down, reconnect, reboot. No dice, the problem reappears when the
second screen is activated. Also, I tried removing the screen rotation (I have
it at 90 degrees for reading articles and stuff) but the flicker is still
there. Also, switching the display ports made no difference, the system was not
fooled. It just switched display designations and went about its usual
business.

Playing around with the display settings I noticed that the problem disappears
when I change the rotated screen's resolution to 1280x800, which also changes
the refresh rate to 75hz. All lower available resolutions cause the flicker to
disappear, the two higher ones (1280x960 and 1280x1024) make it reappear.


I would appreciate any suggestions you might have on this, I would like to
avoid using fglrx if possible (I will try it as a last resort).

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