[Bug 108379] high idle power consumption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108379

            Bug ID: 108379
           Summary: high idle power consumption
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: grmat at sub.red

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.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20181016/a2245c5e/attachment.html>