*** This bug is a duplicate of bug 269904 ***
https://bugs.launchpad.net/bugs/269904
Anakin, you're brilliant! I've been trying to track down the cause of
this problem for ages, and your suggestion has just helped me find it.
Apparently the redraw problems are caused by a race condition, which
occurs with compiz in combination with nvidia driver versions above
177.76. According to nvidia developers at the nvnews forums: "[the cause
of the problem] is a race condition between the X server and compiz
that's the result of a fundamental design problem in the way the Damage
extension works." and "[fixing it] will require more changes to the
Damage and GLX extensions, the X server, Compiz, and the NVIDIA X
driver."
Because it is apparently caused by a design problem, it will probably
take some time before the problem is fixed. The only real way to ensure
it doesn't happen is not to use compiz. But on some systems it helps to
change settings that affect the timing of pixmap uploads to the GPU. You
can for instance try to disable the compiz "--loose-binding" option, or
play with the powermizer settings.
I just had a look at the wrapper script that launches compiz in Ubuntu.
It enables --loose-binding on nvidia hardware (which in turn works
around a performance issue with texture binding on nVidia cards), but it
only seems to do this when indirect rendering is disabled (the default
setting). So in theory this should disable --loose-binding without
having to edit the wrapper script or (re)start compiz by hand every
time:
mkdir -p ~/.config/compiz; echo INDIRECT=0 >> ~/.config/compiz/compiz-
manager
It just adds "INDIRECT=0" to the configuration file ~/.config/compiz
/compiz-manager, to force indirect rendering. This will of course
degrade performance and disable some effect plugins, but if it works I
would much prefer it to having the current redraw problems...
See also:
http://www.nvnews.net/vbulletin/showthread.php?t=120892
http://www.nvnews.net/vbulletin/showthread.php?t=124470
** This bug has been marked a duplicate of bug 269904
Screen refresh problems with nvidia on intrepid
--
content of window do not redraw automatically (intrepid)
https://bugs.launchpad.net/bugs/270377
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