[Bug 109059] New: DisplayPort over USB-C not working after resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109059

            Bug ID: 109059
           Summary: DisplayPort over USB-C not working after resume
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mkj at gotu.dk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 142807
  --> https://bugs.freedesktop.org/attachment.cgi?id=142807&action=edit
dmesg output after trying setting monitor on via xrandr

I'm running latest Debian sid/buster on a Dell XPS 9370 laptop (Kabylake-R
graphics).

I've connected an external DisplayPort monitor to my laptop over USB-C through
a Lindy USB 3.1 Type C Docking Station. 
It works fine it seems normally, the DisplayPort is recognized as DP-2-2 in
xrandr. 

After suspending the laptop, and wake it up again, the monitor is blank, but
xrandr says it's still connected and a mode is selected. After setting monitor
"--off" and "--auto" again no picture comes up, and I get the errors shown in
the attached dmesg.

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