high power usage with HD4200 (RS880)
Submitted by Dominik Kopp
Assigned to xf86-video-ati maintainers
Description
Created attachment 67000
the vbios rom
My laptop (Lenovo Edge 11) has the Mobility Radeon HD 4200 Series chip (RS880M)
(windows says it's a HD 4225)
With radeon driver the laptop consumes 20W
Changing the power_profile saves 1W (now 19W):
echo low > /sys/class/drm/card0/device/power_profile
cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 380000 kHz
current engine clock: 200000 kHz
default memory clock: 400000 kHz
However, using the fglrx driver it consumes only 16W.
=> 3-4W less.
The radeon driver should be as energy efficiently as the fglrx.
Attachment 67000, "the vbios rom":
vbios.rom