[Bug 108941] Enabling PP_OVERDRIVE_MASK with dual monitors causes artifacting

[Bug 108941] Enabling PP_OVERDRIVE_MASK with dual monitors causes artifacting

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108941

            Bug ID: 108941
           Summary: Enabling PP_OVERDRIVE_MASK with dual monitors causes
                    artifacting
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: boukehaarsma23@gmail.com

Steps to reproduce:

1) Have dual monitors
2) Enable PP_OVERDRIVE_MASK by flipping the appropriate bit in
amdgpu.ppfeaturemask. (For my configuration I used: 0xfffd7fff)
3) See artifacting.

When using default featuremask, or when using a single monitor with the
overdrive bit enabled behaves correctly. I heard multiple people who have the
same issue, so it does not seem related to my setup.

Setup:
RX480
Linux 4.20-rc5


If additional information is needed please let me know.

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[Bug 108941] Enabling PP_OVERDRIVE_MASK with dual monitors causes artifacting

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https://bugs.freedesktop.org/show_bug.cgi?id=108941

--- Comment #1 from Rigo Reddig <rigo.reddig@gmail.com> ---

I've just recently chatted to boukehaarsma23 about it, as it also affects me.

I have uploaded a video of what this looks like which you can see here:

https://www.youtube.com/watch?v=roHXWtHRhyQ

Interestingly the artifact lines appear to be aligned across the screens,
vsync? 

The main reason though I first came across this is by trying to manually
downclock my GPU. With 2x 60Hz HDMI 1080p monitors attached the GPU is
constantly in a higher power state (both mclkc and sclk) and wastes a
considerable amount of power at idle. This is not a problem with 1 monitor
attached.

Also of note is that even with 2 monitors attached this does not occur on
Windows where the GPU idles at 300MCLK/300SCLK and is significantly cooler.

For comparison about power, according to my UPS my system idles at 112-128W
when the GPU's are downclocking appropriately(1 monitor). This measurement
matches with Windows where the GPU is downclocking to state 0 appropriately.

When it's not downclocking appropriately (2x monitors) it idles at anywhere
between 160-176Watt.


Setup:
2x RX580 Gigabyte 8G (Monitors both on GPU0)
Linux 4.19.4 (Arch Main)
Latest stable KDE Plasma on X

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[Bug 108941] Enabling PP_OVERDRIVE_MASK with dual monitors causes artifacting

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https://bugs.freedesktop.org/show_bug.cgi?id=108941

--- Comment #2 from Rigo Reddig <rigo.reddig@gmail.com> ---
Likely related

https://bugs.freedesktop.org/show_bug.cgi?id=108647
https://bugs.freedesktop.org/show_bug.cgi?id=102646

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[Bug 108941] Enabling PP_OVERDRIVE_MASK with dual monitors causes artifacting

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https://bugs.freedesktop.org/show_bug.cgi?id=108941

--- Comment #3 from braiamp@gmail.com ---
Patch https://patchwork.freedesktop.org/patch/314322/ fixes this issue for me.

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[Bug 108941] Enabling PP_OVERDRIVE_MASK with dual monitors causes artifacting

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https://bugs.freedesktop.org/show_bug.cgi?id=108941

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

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

--- Comment #4 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/628.

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