[Bug 108694] New: External monitor connected through dock says blank

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108694

            Bug ID: 108694
           Summary: External monitor connected through dock says blank
           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: benjamin at sipsolutions.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 142408
  --> https://bugs.freedesktop.org/attachment.cgi?id=142408&action=edit
dmesg with drm.debug=0x106 set and plugging in the dock

Seems to happen quite reliably with my setup, but not necessarily reproducable
with different hardware components. i.e. different laptop, almost identical
kernel seemed fine:

 * X1 Carbon 4th Gen
 * Lenovo OneLink+ dock
 * 1x DELL 1920x1080 external screen
 * 1x DELL U2515H (2560x1440) external screen

The U2515H stayed blank but GNOME (wayland) thought it was there. Attaching
dmesg output with drm.debug=0x106 set. Kernel 4.18.16-300.fc29.x86_64 seems to
behave better in this regard.

Kernel was drm-tip, latest commit:

commit 9ef57c71386778d8425b4884252f1919184645a1 (HEAD, drm-tip/drm-tip)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Oct 19 12:25:58 2018 +0100

    drm-tip: 2018y-10m-19d-11h-24m-46s UTC integration manifest

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