[Bug 217621] New: AMDGPU - Internal 4K display used with 1920x1080 leads to screen flickering and distortion, regression from commit edcfed8671ee57bb599184f2e12a1b3e11b32306

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217621

            Bug ID: 217621
           Summary: AMDGPU - Internal 4K display used with 1920x1080 leads
                    to screen flickering and distortion, regression from
                    commit edcfed8671ee57bb599184f2e12a1b3e11b32306
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: der.timosch@gmail.com
        Regression: No

Created attachment 304514
  --> https://bugzilla.kernel.org/attachment.cgi?id=304514&action=edit
Picture showing distorted display

I'm on Manjaro, using kernel 6.3 series. The following problem is also
reprocucible with 6.1 series (tested 6.1.36) and with NixOS using >=6.3.9.

I usually use my internal display and an external display with 3840x2160 and
100% scaling. I use my internal display not in its native 3840x2160 resolution
(and 200% scaling), but with 1920x1080 and 100% scaling, to prevent scaling
issues under Gnome when moving windows from one display to the other. That
worked until I updated from 6.3.8 to 6.3.9 (and lately 6.3.10). I suspected the
following commit to be responsible: edcfed8671ee57bb599184f2e12a1b3e11b32306.
I created a patch to revert the commit and recreated the amdgpu module and
everything is fine again.

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