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

--- Comment #26 from luckylud@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...

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