[Bug 199319] New: Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

            Bug ID: 199319
           Summary: Flickering screen on AMDGPU and DC with Linux 4.16-2
           Product: Drivers
           Version: 2.5
    Kernel Version: Linux 4.16
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mail at rainer-finke.de
        Regression: No

Description: I upgraded to Linux 4.16-2 from the Arch Linux testing repository,
but since then the screen is flickering with my RX480 and AMDGPU.DC enabled.
The flickering is visible especially on Plasma-Wayland as soon as I move the
mouse, it is like a bright flickering, not like a graphical corruption. On SDDM
or Plasma X11 the flickering is much less frequent, but even there the screen
flickers from time to time. I use a 4K display connected via DisplayPort.
A downgrade to Linux 4.15 stable solved this even tough AMDGPU.DC is enabled as
well. 
I couldn't reproduce the same issue with my AMD Ryzen 5 2500U Vega APU
(1920x1080), so the issue might be related to the RX480 or 4K.


Additional info:
* Linux 4.16-2 from Arch Linux testing
* AMDGPU.DC=1 (kernel parameter)
* 4K display DisplayPort


Steps to reproduce:
1. Ugrade to Linux 4.16.2 with AMDGPU.DC enabled on a RX480
2. Screen is flickering when moving the mouse

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