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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
          Reporter: mcoffin13 at 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 at 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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