[Bug 110286] New: [ICL] SDP built-in eDP display sometimes gets stuck in bogus retrain loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110286

            Bug ID: 110286
           Summary: [ICL] SDP built-in eDP display sometimes gets stuck in
                    bogus retrain loop
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lyude at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143811
  --> https://bugs.freedesktop.org/attachment.cgi?id=143811&action=edit
Boot with eDP, hotplug mini-DP

Hi! I've got myself an icelake SDP: Ice Lake-U 4+2 Alpha OSV. things mostly
work, but there's one pretty bizarre issue I've been hitting with the built-in
eDP display.

It seems that if I boot up the machine with only the eDP display connected,
things work fine. However: if I plug in a display into the Mini-DP port then
the Mini-DP display comes up, but the eDP display suddenly gets stuck in a
retrain loop and doesn't come back on.

Things get a bit weirder though: if I have both the eDP and mini-DP display
connected when booting up the machine, then things never break. I can even
hotplug the mini-DP display after booting up, and the eDP display retrains
itself just fine.

Will attach dmesg logs with:

- Booting with eDP connected, and hotplugging
- Booting with eDP and Mini DP

Along with edid for the eDP display

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