[Bug 108322] RX580 Display flickering after waking from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108322

            Bug ID: 108322
           Summary: RX580 Display flickering after waking from suspend
           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: bmilreu at gmail.com

GPU RX580 Nitro+ over DisplayPort to a single AOC 75hz monitor. Issue is on
last kernels 4.18 4.19 but not in 4.14.

Screen starts flickering until reboot if I sleep/wake or if I manually switch
the monitor off/on.

Tried to turn amdgpu.dc=0, screen then flickers everywhere anytime unless I
manually change frequency from 75hz to 60hz. That only solves it inside KDE
though.

Checking gpu related logs shows this error, but couldn't find anything else:
"Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff"

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