(In reply to comment #21)
> Here is '/sys/kernel/debug/dri/0/radeon_pm_info' output I get:
> 
> 1. with dpm=1
>     uvd    vclk: 0 dclk: 0
>     power level 1    sclk: 30000 mclk: 40500 vddc: 900
> 
> 2. without dpm=1
>     default engine clock: 500000 kHz
>     current engine clock: 499500 kHz
>     default memory clock: 500000 kHz
>     current memory clock: 495000 kHz
>     voltage: 1000 mV
>     PCIE lanes: 16
> 
> The output format differs, but if clocks values dimensions are the same,
> then it is about 10 times less the in (2)

The driver uses 10khz units internally.  Without dpm the output adds the extra
0.

30000 = 300 Mhz