On HD6850, Power Profile doesn't change if 2 screen is attached.
Submitted by Erdem U. Altınyurt
Assigned to Default DRI bug account
Description
echo low > /sys/class/drm/card0/device/power_profile
Setting doesn't switch GPU into lower power state with 2 screen attached...
Using OpenSUSE 11.2, mesa, drm and radeon trunk
With one screen attached, everything works.
With 2 screen attached and GPU in default (high) mode :
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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: 774980 kHz
default memory clock: 1000000 kHz
current memory clock: 1000000 kHz
voltage: 1150 mV
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In this state, if I disable second screen, than GPU clock lower
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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
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In this low power state, if you enable second screen GPU keeps in lower state.
You can increase power profile with
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echo high > /sys/class/drm/card0/device/power_profile
But trying to reduce power profile again, doesn't work.
Thanks.