[Bug 107845] New: Problems with (tiled) MST display (Dell UP3214Q)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107845

            Bug ID: 107845
           Summary: Problems with (tiled) MST display (Dell UP3214Q)
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop at molgen.mpg.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 141467
  --> https://bugs.freedesktop.org/attachment.cgi?id=141467&action=edit
Linux 4.18.6 messages

Using the MST display Dell UP3214Q connected over DisplayPort, there are
several problems, which are happening since at least 4.14 and are still present
with Linux 4.18.6.

1.  Restarting the system and leaving the monitor on, neither the Fujitsu
firmware nor Linux is able to display something. (This happens rarely.)

2.  Turning the monitor off and back on, sometimes the monitor does not detect
a signal, and only after waiting a while and pressing keys, or turning it off
and back on several times, a connection is established and an image displayed
(which might have the problems below though).

3.  The panel order is sometimes switched (LR becomes RL, where X and Y are
panels).

4.  The X server shows each panel as one screen, and does not overlap them.

5.  Instead of one full screen of 3840x2160, only one screen 1920x2160 seems to
be detected and stretched over the whole display.

The device below is used.

00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530
[8086:1912] (rev 06)

Please find the debug log attached. In this time the aforementioned problems
happened.

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