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[hansvw <hansvw@xxxxxxxxxxxxxx>]

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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