[Bug 211997] New: sys-kernel/gentoo-sources-5.11.2 crash upon disconnect HDMI monitor AMDGPU

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211997

            Bug ID: 211997
           Summary: sys-kernel/gentoo-sources-5.11.2 crash upon disconnect
                    HDMI monitor AMDGPU
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.11.2-gentoo
          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: stefan at konink.de
        Regression: No

Created attachment 295529
  --> https://bugzilla.kernel.org/attachment.cgi?id=295529&action=edit
dmesg

When disconnecting a second monitor on a AMD Ryzen 5 2500U with Radeon Vega
Mobile Gfx the system seems to hang. It is reachable over a wired connection,
but the screen (other than a moving mouse) does not repond to any input.
Connecting new devices such as an external mouse does not seem to influence the
running session.

Connected over netconsole, and later direct via the wired connection the error
presented in dmesg:

[drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR*
[CRTC:70:crtc-1] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR*
[CRTC:70:crtc-1] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR*
[PLANE:50:plane-2] flip_done timed out

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