With recent xorg driver, I can get screen back when suspend to memory. But the problem still exists when suspend to disk, so the workaround is still needed when I suspend to disk. Using the latest radeon driver from sid cannot help on this. I tried xserver-xorg-video-radeon 1:6.12.6-1 and 1:6.12.192-2, both not working in STD mode. The kernel I'm using is 2.6.32-3-686 from testing.