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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unsynchronized rendering with MST monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103848">103848</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Unsynchronized rendering with MST monitor
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>DRM/Intel
</td>
</tr>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>pmenzel+bugs.freedesktop@molgen.mpg.de
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>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.</pre>
</div>
</p>
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