Please attach the output of `lspci -vvnn` and `xrandr --verbose`
Also, are you able to control the power state directly using `xset
+dpms`, `xset dpms force on` and other xset commands?
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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Power management doesn't turn off monitor.
https://bugs.launchpad.net/bugs/292688
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