[Bug 42854] New: Power management doesn't work on dualhead

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42854

             Bug #: 42854
           Summary: Power management doesn't work on dualhead
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: cuu508 at gmail.com
         QAContact: xorg-team at lists.x.org


Setting power_profile to low doesn't seem to have an effect with dual heads
active. 

with single head active:

echo low > /sys/class/drm/card0/device/power_profile
cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 775000 kHz
current engine clock: 99990 kHz
default memory clock: 1000000 kHz
current memory clock: 300000 kHz
voltage: 950 mV

after enabling the second monitor:

cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 775000 kHz
current engine clock: 774980 kHz
default memory clock: 1000000 kHz
current memory clock: 1000000 kHz
voltage: 1150 mV

Disable one head and voltages drop down again...

Card: Radeon HD 6850
Fresh 32bit Fedora 16, it was the same previously on F15 too.

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