Experienced the same issue on an older radeon card (radeon 8500)
following an automated update of xserver-xorg-video-radeon (update
manager suggestion). Solved the issue by adding some sections to the
auto-configured xorg.conf. Notably changing to the older "XAA"
AccelMethod appears to fix the issue:
Section "Device"
Identifier "Radeon 8500"
Driver "ati"
BusID "PCI:1:0:0"
Option "XAANoOffscreenPixmaps"
Option "AccelMethod" "XAA"
Option "EnablePageFlip" "true"
Option "TripleBuffer" "true"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Radeon 8500"
EndSection
--
font corruption with xserver-xorg-video-ati driver
https://bugs.launchpad.net/bugs/475428
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