<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - DVI display on DisplayPort-MST behind DP-DVI converter gets no EDID"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91614">91614</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>DVI display on DisplayPort-MST behind DP-DVI converter gets no EDID
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cweiske@cweiske.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>Created <span class=""><a href="attachment.cgi?id=117641" name="attach_117641" title="dmesg with drm.debug=14">attachment 117641</a> <a href="attachment.cgi?id=117641&action=edit" title="dmesg with drm.debug=14">[details]</a></span>
dmesg with drm.debug=14
My setup: Thinkpad T440p with an Ultra Dock, two identical displays connected
to the dock. DP2-1 connected via a DP-DVI converter to the docks' display port
socket, DP2-2 connected directly to the dock's DVI port.
DP2-1 gets the wrong resolution; "xrandr --verbose" shows that no EDID data are
available. I can manually add the correct resolution with "xrandr --addmode",
which makes the display work on the correct resolution.
I can swap the displays physically, and the one connected to the DVI port
always gets the correct resolution - so it is not a display issue.
I connected the display via a MiniDP-DVI adapter directly to the laptop
(bypassing the docking station) and it got the correct resolution.
Attached is dmesg output with drm.debug=14
Xorg server: 1:7.7+1ubuntu8.1
xf86-video-intel: git 2015-07-31 17:17,
bc063c9f4af90542297877281b1b9f4692dafde4
Linux kernel: Linux csystems 4.1.4-dp-mst #1 SMP Fri Aug 7 09:25:36 CEST 2015
x86_64 x86_64 x86_64 GNU/Linux</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>