[Bug 106718] On Ubuntu Bionic with kernels 4.15 and above, RX480 Displayport outputs don't work (dmesg reports "not connected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106718

            Bug ID: 106718
           Summary: On Ubuntu Bionic with kernels 4.15 and above, RX480
                    Displayport outputs don't work (dmesg reports "not
                    connected)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: icekhaos at hotmail.com

Anything from at least 4.15 up to 4.17-rc1 under Bionic makes the Displayport
connections fail to even detect a display, while anything 4.14.x works and
detects it perfectly.

Is the PCI ROM error related? Is this a duplicate? I can provide xorg logs
later today.

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