[Bug 87319] New: Dock with builtin DP/VGA "dongle" fails cycling through modes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87319

            Bug ID: 87319
           Summary: Dock with builtin DP/VGA "dongle" fails cycling
                    through modes
           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: tjaalton at ubuntu.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 110847
  --> https://bugs.freedesktop.org/attachment.cgi?id=110847&action=edit
dmesg from switch to internal only

Cycling through display modes (external, clone, extended, internal only..)
somehow drops the connection to VGA after it has switched back to using
internal only:

[  121.653437] [drm:intel_modeset_stage_output_state] [CONNECTOR:35:DP-2] to
[NOCRTC]

full logs from the switch to internal only attached

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