Adding
Option "EXAOptimizeMigration" "true"
Option "MigrationHeuristic" "greedy"
to the "Device" section of my /etc/X11/xorg.conf solved the issue for
me:
Section "Device"
Identifier "Configured Video Device"
Option "EXAOptimizeMigration" "true"
Option "MigrationHeuristic" "greedy"
EndSection
[lspci]
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated
Graphics Controller (rev 0c)
--
[exa] XSetClipMask+XPutImage = garbage on an off-screen buffer
https://bugs.launchpad.net/bugs/325169
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