[Bug 107213] [amdgpu/DisplayPort] KDE Wayland session is segfaulting right after login

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107213

            Bug ID: 107213
           Summary: [amdgpu/DisplayPort] KDE Wayland session is
                    segfaulting right after login
           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: shtetldik at gmail.com

I just tried to use a Wayland session with KDE Plasma 5.13.2 (Debian testing)
and it's segfaulting right after login and falling back to sddm.

That's what I see in dmesg:

[  176.359816] [drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us *
3000 tries - dce110_stream_encoder_dp_blank line:956
[  176.814144] QThread[2620]: segfault at f ip 00007f30f30b0e60 sp
00007f30e506e4f0 error 4 in libwayland-client.so.0.3.0[7f30f30a9000+d000]

Not sure whether it's amdgpu problem of something with KWin.

GPU: AMD Vega 56, connected over DisplayPort.

OpenGL renderer string: Radeon RX Vega (VEGA10, DRM 3.25.0, 4.17.0-1-amd64,
LLVM 6.0.1)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.1.3

Corresponding KDE bug: https://bugs.kde.org/show_bug.cgi?id=396066

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