[Bug 108379] high idle power consumption

[Bug 108379] high idle power consumption

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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@lists.freedesktop.org
          Reporter: grmat@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.

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[Bug 108379] high idle power consumption

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

--- Comment #1 from Alex Deucher <alexdeucher@gmail.com> ---
Please attach your xorg log (if using X) and dmesg output.

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[Bug 108379] high idle power consumption

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

--- Comment #2 from grmat@sub.red ---
Created attachment 142098
  --> https://bugs.freedesktop.org/attachment.cgi?id=142098&action=edit
xorg log

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[Bug 108379] high idle power consumption

[bugzilla-daemon]

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

--- Comment #3 from grmat@sub.red ---
Created attachment 142099
  --> https://bugs.freedesktop.org/attachment.cgi?id=142099&action=edit
dmesg output

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[Bug 108379] high idle power consumption

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

grmat@sub.red changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #142098|0                           |1
        is obsolete|                            |

--- Comment #4 from grmat@sub.red ---
Created attachment 142100
  --> https://bugs.freedesktop.org/attachment.cgi?id=142100&action=edit
xorg log

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[Bug 108379] high idle power consumption

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

John <john.ettedgui@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |john.ettedgui@gmail.com

--- Comment #5 from John <john.ettedgui@gmail.com> ---
Is there anything we can do to help this?

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[Bug 108379] high idle power consumption

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

--- Comment #6 from grmat@sub.red ---
The SCLK is still fixed at max clock with WQHD, 144 Hz. Is Polaris considered
legacy already?

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[Bug 108379] high idle power consumption

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

--- Comment #7 from xc <juha@inbox.lv> ---
I have RX470 and high idle power consumption has been present since hdmi/dp
audio has been in kernel. Power consumption meter readings are ~20w higher with
audio enabled. I am using Gentoo and compiling kernel without hdmi/dp audio
support normalizes consumption.

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[Bug 108379] high idle power consumption

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

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #8 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/560.

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