[Bug 49981] On HD6850, Power Profile doesn't change if 2 screen is attached.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49981

--- Comment #26 from luckylud at free.fr ---
I'm with a radeon 6750m mbp 8.2
It's a TURK chip 
>From Linux >= 3.7 I can't have low power working :
# cat /sys/class/drm/card0/device/power_method
profile
# cat /sys/class/drm/card0/device/power_profile
low

but  # cat /sys/kernel/debug/dri/0/radeon_pm_info :
default engine clock: 600000 kHz
current engine clock: 599970 kHz
default memory clock: 793750 kHz
current memory clock: 793750 kHz
voltage: 1000 mV

I've an external screen connected with HDMI cable, and laptop screen is off.

If the two screens are ON, the GPU and memory power go high, but not with only
one screen (LCD or external) on Linux 3.6.11 :

# cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 600000 kHz
current engine clock: 99990 kHz
default memory clock: 793750 kHz
current memory clock: 150000 kHz
voltage: 900 mV

I've tried 3.8rcXXX and 3.9 WIP from here :
http://cgit.freedesktop.org/~agd5f/linux/snapshot/linux-drm-next-3.9-wip.tar.gz

Nothing can turn my radeon card at low power, Linux 3.7, 3.8, 3.9 burn my
laptop ...

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