[Bug 109795] New: Thunderbolt display not detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109795

            Bug ID: 109795
           Summary: Thunderbolt display not detected
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: max at element.in
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143493
  --> https://bugs.freedesktop.org/attachment.cgi?id=143493&action=edit
dmesg_xrandr_lspci_lsusb_logs

I am using a Dell XPS 13 (9370) connected to a Caldigit TS3 Plus thunderbolt
dock. On this dock I have two monitors connected. One is connected to the
display port of the dock, the second one is connected to an USB-C Thunderbolt
port using an USB-C to mini DP adapter.

The second monitor is only detected, when I _first_ plug in the adapter and
_then_ plug in the the cable to the adapter. This also only works when the
system has booted _and_ I am logged in. I already disabled thunderbolt security
completely in UEFI. Once the monitor has been detected it is also working
during boot, when I restart the system. This also appears when directly
plugging in the adapter to a Thunderbolt port of the laptop.

I can reproduce the issue also with latest DRM-tip kernel 
https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/2019-02-21/


I Reported this bug already to Ubuntu kernel:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1817070

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