Created attachment 67000 [details] 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.
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