[Bug 103848] New: Unsynchronized rendering with MST monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103848

            Bug ID: 103848
           Summary: Unsynchronized rendering with MST monitor
           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

Linux 4.14, X.Org server 1.9.5, and the modesetting driver are used.

```
$ lspci -nn -s 0:02.0
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530
[8086:1912] (rev 06)
```

The monitor Dell UP3214Q is connected over DisplayPort, and DP 1.2 is used with
MST (Multi-Stream Transport) as two panels are used to render 3840 x 2160 at 60
Hz.

```
$ xrandr --listmonitorsMonitors: 1
 0: +Auto-Monitor-1 3840/698x2160/392+0+0  DP-2-9 DP-2-8
```

Using Xfce 4.12 and putting a window over the common border of the two panels,
and moving it around, it’s clearly not in sync. The same can for example be
seen, when scrolling a Web site with Firefox 57.0, where the window covers both
panels.

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