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0e1f616
(Get the code!)
I'm also having this problem on a Dell Inspiron 1501 running Ubuntu 10.04 x64.
Kernel version is 2.6.32-24.
This a _severe_ problem for me. When I encode videos, I have always closed the screen and left the laptop. Occasionally, upon opening the lid, the entire screen has turned a weird whitish color, which slowly fades to black. Nothing I do (i.e. Ctrl-Alt-F4) will fix the screen but a hard reboot. While I'm not sure exactly what causes the problem, I suspect it would not occur if the screen (and backlight) turned off when I close the lid.
Two notes:
1. "sudo radeontool light off" turns the screen off until I close and reopen the lid.
2. I think the screen blanked but the backlight remained on until recently. I think the screen began to stay on as well after I updated to the proposed kernel (2.6.32-24).