[Bug 19168] xset dpms force off does not turn off LCD backlight

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed May 27 09:45:45 PDT 2009


--- Comment #9 from Thomas Champagne <lafeuil at gmail.com>  2009-05-27 09:45:45 PST ---
I thought a lots about this problem and I checked in differents projects
(PowerDevil for KDE and Gnome Power Management) to see how the screen is
switched off. 
This projects use the DPMS function to switch off the screen (define in

The problem on Ibook is that the screen's power is controled by Power
Management Unit (PMU). There is a module on Linux system. You can control this
device with /dev/pmu. 

Do you think radeon driver must control PMU or each desktop power management
(Powerdevil, GPM...) must control PMU themselves?

Thanks in advance for your help.

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