[Bug 110300] New: [KBL-R] USB-C external display doesn't work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110300

            Bug ID: 110300
           Summary: [KBL-R] USB-C external display doesn't work
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jason at jlekstrand.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Everything worked fine on 4.18 and 4.19 was ok but fickle.  As of 4.20, GNOME
shell won't recognize the external display at all.  I plug it in and the main
laptop screen goes black and the monitor continues to be in power-save mode. 
If I unplug, everything goes back to normal on my laptop.  Maybe the link just
never trains?

I've tried with two different Dell monitors with two different USB-C HDMI
adapters (Cabel Matters and a Kensington dock) and with and without my KVM
switch.  None of it makes a difference.

Hardware: Dell XPS 13 9360 (KBL-R)
Kernel: 4.19.13 is okish, 4.20.15 and 5.0.4 are broken.  All kernels are Fedora
builds
Userspace: Fedora 29 with GNOME Wayland, everything updated

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