https://bugs.freedesktop.org/show_bug.cgi?id=32006
--- Comment #14 from Philip Prindeville philipp@redfish-solutions.com --- Here's a screenshot showing RGB 'snow' as the background and random bits of backing store buffer at the bottom of both screens.
Note that both screens (HDMI-0 on the left and DVI-0 on the right) are on the Radeon 4350 card.
ftp://ftp.redfish-solutions.com/pub/Screenshot from 2013-05-20 14:42:55.png