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).

-- 
Closing laptop lid doesn't cause the screen to go blank
https://bugs.launchpad.net/bugs/449188
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