[Bug 107049] monitor not found in 4.17+ kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107049

            Bug ID: 107049
           Summary: monitor not found in 4.17+ kernel
           Product: DRI
           Version: unspecified
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: dan at danny.cz
                CC: bcrocker at redhat.com

When booting kernel 4.17 or 4.18-pre on Power9 machine with Radeon Pro WX 4100
I get no output on a monitor connected thru DisplayPort, the monitor is not
detected by the driver and a "PowerPlay" error appears in the kernel log. When
booting 4.16 kernel (kernel-4.16.16-300.fc28.ppc64le), all is OK. See attached
dmesg (resp. journalctl -k -b) outputs.

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