[Bug 101463] New: Could not switch the monitor configuration

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101463

            Bug ID: 101463
           Summary: Could not switch the monitor configuration
           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: ethan.hsieh at canonical.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131995
  --> https://bugs.freedesktop.org/attachment.cgi?id=131995&action=edit
kernel log and Xorg.0.log

Could not switch the monitor configuration

Reproduction steps:
1. Two external monitors with DP/mDP cable connected to Dell Dock.
All three displays: Built-in LCD, DP and mDP monitor
2. Boot to Ubuntu Desktop
3. See three displays (extend mode)
4. Unplug the DP cable from dock
5. Go to [Ubuntu] => [All Settings] => [Displays],
Press "Detect Displays" every second until [Displays] shows correct amount of
Display
6. Unplug the mDP cable from dock
7. do 5 again
8. Plug the mDP cable back into dock
9. do 5 again
10. Plug the DP cable back into dock
11. do 5 again
12. Got to 4.

Additional information:
1. Kernel: 4.10.0-21 x86_64
   Kernel: 4.12.0-994-generic x86_64
2. Linux distribution: Ubuntu 16.04.2 LTS
3. Laptop: Dell Precision 5520
4. Dell Business Thunderbolt Dock - TB16
https://goo.gl/vFDjpi
5. X.0.org:
a) log/1/Xorg.0.log: (drm.debug=0xe and xserver-xorg-video-intel
--enable-debug=full)
[126.895]KMSG: [drm:drm_atomic_helper_check_modeset [drm_kms_helper]] No
suitable encoder found for [CONNECTOR:74:DP-5]
[126.896](EE) intel(0): failed to set mode: Bad file descriptor [9]
b) log/2/Xorg.0.log (drm.debug=0xe)
[730.060] (EE) intel(0): failed to set mode: Invalid argument [22]

How to recover:
Press the "Close" button in the pop-up window "Could not switch the monitor
configuration".
PS: It's not easy to press the button because all windows have wrong
proportion. (log/The_pop-up_window_and_wrong_proportion.png)

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