I'm having the same issue with 32-bit Ubuntu 10.10 on Acer Aspire 5100
(AMD Turion x2 Radeon 200M). Screen goes blank but the backlight never
turns off.
Command xset dpms force off works fine but the power manager just
can't turn off the backlight no matter what settings I've tried. I've
posted a thread on ubuntu forums about this too:
http://ubuntuforums.org/showthread.php?t=1605571
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lcd backlight doesn't shutdown when screen is locked
https://bugs.launchpad.net/bugs/440061
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