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high idle power consumption

Submitted by grmat @grmat

Assigned to Default DRI bug account

Link to original bug (#108379)

Description

system:

  • Polaris10 (Ellesmere)
  • Linux 4.18.14
  • WQHD (2560*1440 pixels) monitor with 144 Hz (DisplayPort)

expected behaviour:
GPU power states should be lowered to the minimum states while idling to save power, heat and noise.

actual behaviour:
- DC on (default):
GPU stuck at highest SCLK DPM state, power consumption as per amdgpu_pm_info is ~24 Watts

- amdgpu.dc=0:
MCLK stuck at high DPM state, power consumption as per amdgpu_pm_info is ~26 Watts

- Windows:
correct (lowest) SCLK/MCLK DPM states, measured power consumption is ~16 Watts lower compared to Linux


Note: https://bugzilla.kernel.org/show_bug.cgi?id=201275 fixed a regression causing *additional* power draw (SCLK and MCLK both at max, power consumption at ~38 Watts while idling).

I can't tell if it's a regression as I've just recently got the GPU. Randomly tested kernels from within 4.17 to 4.18.14 all suffer from this issue.