[Bug 107301] System display will be gone suddenly after amdgpu is loaded and gdm is started

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107301

            Bug ID: 107301
           Summary: System display will be gone suddenly after amdgpu is
                    loaded and gdm is started
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jian-hong at endlessm.com

Created attachment 140723
  --> https://bugs.freedesktop.org/attachment.cgi?id=140723&action=edit
System's journal log with 4.18-rc5

I have a hardware whose MB is Acer Nitro N50-100 (AMD Ryzen:
ZD2600BBM68AF_38/34_Y) and graphic card is AMD Radeon RX 580.

I have tried Linux kernel 4.18-rc5 with parameters "amdgpu.dc_log=1
drm.debug=7" on this hardware.  System display will be gone suddenly and not
come back after amdgpu is loaded and gdm is started.  However, I still can ssh
into the system. The error was shown:

[   23.007070] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma0 timeout,
last signaled seq=173, last emitted seq=175
[   23.007087] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout,
last signaled seq=26, last emitted seq=27
[   23.007088] [drm] GPU recovery disabled.
[   23.007090] [drm] GPU recovery disabled.

The attachment is the full journal log.

If I blacklist amdgpu module, it can boot and go into the desktop environment
correctly.

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