Random graphics corruption -- related to logo feature?

[nanto]

I kept dri disabled till now, but I hate slow opengl screensavers

[hluk]

For me screen corruptions disappeared after putting the lines below into xorg.conf's device section (where my current fglrx 8.42.3 driver was).

Option	    "OpenGLOverlay" "off"
Option	    "BlockSignalsOnLock" "on"
Option	    "KernelModuleParm" "locked-userpages=0"

ps: It's either all lines or one of them - so, good luck .