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Checking upon /sys/kernel/debug/dri/0/radeon_pm_info, puzzled me. It seems that there are only one power level and some are disabled. It shows :

uvd    disabled
vce    disabled
power level 0    sclk: 30000 vddc: 3800

Why are they disabled and there are only one power level?

Background

I'm using a laptop with AMD A6-6310 APU with AMD Radeon R4 Graphics with the default open source radeon kernel module. Compared to the fglrx module, the battery usage is about 6 mW, as reported by powertop, but when the radeon kernel module was used in the same scenario, the battery usage is 11mW. I tried setting these and it did not change much :

 echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level
 echo battery > /sys/class/drm/card0/device/power_dpm_state.

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