If you have an intel graphics card and are using 13.10, the default acceleration method was changed from uxa to sna. On some systems, sna acceleration causes graphic "artefacts". The solution (workaround?) is to revert to uxa acceleration.
To find out which acceleration method you are using:
Code:
cat /var/log/Xorg.0.log | grep -i accelmethod
...example result:
[ 4.104] (**) intel(0): Option "AccelMethod" "sna"
To revert to uxa acceleration, with root privileges, create a /usr/share/X11/xorg.conf.d/20-intel.conf file with the following content:
Code:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "uxa"
Option "TearFree" "true"
EndSection
...save the file, log out and log in again.
On reboot, check whether its properly enabled with:
Code:
cat /var/log/Xorg.0.log | grep -i accelmethod
...and check for the artifacts again.
***Remember, this will only work with intel graphics cards.
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