Same trouble.
Apple 20" iMac7,1
ATI Mobility Radeon HD 2600 XT
fglrx video driver.

command "xset dpms force off"
  in Ubuntu 9.04 - don`t turn backlight off, only blank screen  
  in Ubuntu 8.04 and Ubuntu 8.10 (updated from 8.04) - works fine

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[jaunty] dpms does not switch off backlight on laptop screen
https://bugs.launchpad.net/bugs/363059
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