[dpm] rs880: Power usage doesn't drop with dpm=1
Submitted by Dominik Kopp
Assigned to xf86-video-ati maintainers
Description
My laptop (Lenovo Edge 11) has the Mobility Radeon HD 4200 Series chip (RS880M)
(windows says it's a HD 4225)
It consume with fglrx ~16W. (kernel 3.4.47)
With radeon (kernel 3.11-rc2) and power_profile=low ~20W
With radeon.dpm=1 (kernel 3.11-rc2) ~20W
linux-7goe:/home/dom # echo battery >/sys/class/drm/card0/device/power_dpm_state
linux-7goe:/home/dom # echo low> /sys/class/drm/card0/device/power_dpm_force_performance_level
linux-7goe:/home/dom # modprobe ec_sys
linux-7goe:/home/dom # cat /sys/kernel/debug/dri/64/radeon_pm_info
uvd vclk: 0 dclk: 0
power level 0 sclk: 20000 vddc_index: 1
The fglrx still uses ~4W less than radeon.dpm=1
It would be great when radeon.dpm=1 uses as less power as the fglrx driver.