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: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
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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