[Bug 207331] New: commit "drm/amdgpu: fix gfx hang during suspend with video playback" breaks reboot/shutdown

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207331

            Bug ID: 207331
           Summary: commit "drm/amdgpu: fix gfx hang during suspend with
                    video playback" breaks reboot/shutdown
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.6.5
          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: custos.mentis at gmail.com
        Regression: No

Created attachment 288569
  --> https://bugzilla.kernel.org/attachment.cgi?id=288569&action=edit
lspci -vvv

After updating kernel from 5.6.4 to 5.6.5 reboot and shutdown do not work any
more. My laptop Lenovo Thinkpad T495 is simply hanging forever with display
turned off, but the keyboard backlit and power led on.

I did bisection and it points to

drm/amdgpu: fix gfx hang during suspend with video playback (v2)

kernel stable 5.6.x commit: a1f57b87ddcc869b576aca73608f35cb436c3fdc
kernel stable 5.4.x commit: bdac1d76a310578b3ad081df2db97da59e241010

Indeed, after reverting this commit, both kernels reboot or shutdown properly.

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