[Bug 110845] [DC-only][regression] cannot select full refresh rate on 5.2rc - 144Hz 2560x1440

[Bug 110845] [DC-only][regression] cannot select full refresh rate on 5.2rc - 144Hz 2560x1440

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=110845

            Bug ID: 110845
           Summary: [DC-only][regression] cannot select full refresh rate
                    on 5.2rc - 144Hz 2560x1440
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: mcoffin13@gmail.com

Somewhere between 5.1 and amd-staging-drm-next for 5.2-rc1, I stopped being
able to set my Acer XV272U 144Hz 1440p display in its 144Hz setting at
2560x1440 resolution.

1920x1080@144Hz still works.

This only happens under the display core driver. Setting amdgpu.dc=0 fixes it,
but that is not needed on the 5.1 kernel.

I will bisect tonight when I get home and have access to my AMD card.

Card: XFX RX 590
Kernel: current AMD-staging-drm-next HEAD.

The issue occurs both in Xfce4, and in sway (wayland), so I’m assuming that the
desktop environment has little to do with the issue.

Sorry for bad formatting on mobile, I wanted to get this in and filed with the
5.2 release coming up.

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[Bug 110845] [DC-only][regression] cannot select full refresh rate on 5.2rc - 144Hz 2560x1440

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https://bugs.freedesktop.org/show_bug.cgi?id=110845

--- Comment #1 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
My guess is that this is probably related to the:

https://patchwork.freedesktop.org/patch/306397/

patch. It might not be defaulting to 8bpc as the maximum, limiting you to 120Hz
at 1440p.

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[Bug 110845] [DC-only][regression] cannot select full refresh rate on 5.2rc - 144Hz 2560x1440

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=110845

--- Comment #2 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
This patch should fix it:

https://patchwork.freedesktop.org/patch/308794/

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[Bug 110845] [DC-only][regression] cannot select full refresh rate on 5.2rc - 144Hz 2560x1440

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=110845

--- Comment #3 from Matt Coffin <mcoffin13@gmail.com> ---
Thanks. I will test tonight with the patch applied when I have access to an AMD
card.

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[Bug 110845] [DC-only][regression] cannot select full refresh rate on 5.2rc - 144Hz 2560x1440

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https://bugs.freedesktop.org/show_bug.cgi?id=110845

--- Comment #4 from Matt Coffin <mcoffin13@gmail.com> ---
I just tested this now on my setup with this patch on top of
amd-staging-drm-next, and all looks good! Thank you kindly.

Too bad this one was easy enough that I didn't get to do any learning. Now, on
to the power management issues I see under load :).

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[Bug 110845] [DC-only][regression] cannot select full refresh rate on 5.2rc - 144Hz 2560x1440

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https://bugs.freedesktop.org/show_bug.cgi?id=110845

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

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

--- Comment #5 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/811.

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