https://bugs.freedesktop.org/show_bug.cgi?id=56405
--- Comment #39 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #38)
The distorted graphics problem disappears when setting the option Option "NoAccel" "on". (This may be obvious to the experts.)
In this mode a new phenomenon appears: When moving th mouse to the Activities corner and the "summarizing display" is shown, the background consists of a corrupted image.
That option disables all hardware acceleration. All rendering is done in software.