<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 - Cannot get MST display back after power cycle"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98306">98306</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Cannot get MST display back after power cycle
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>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>kirill@shutemov.name
</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=127375" name="attach_127375" title="dmesg with drm.debug=0xe">attachment 127375</a> <a href="attachment.cgi?id=127375&action=edit" title="dmesg with drm.debug=0xe">[details]</a></span>
dmesg with drm.debug=0xe
Steps to reproduce:
1. Boot machine (Haswell) with MST monitor (Dell UP2414Q, DP1.2 enabled)
attached. It boots fine.
2. Disable the monitor with button on front.
3. Re-enable the monitor. Nothing appears on the screen. It goes to sleep.
Before commit 27d4efc5591a5853de54713bc717de73c8951e17 I used workaround with
switching console and back. I doesn't work. Not anymore. See <a class="bz_bug_link
bz_status_CLOSED bz_closed"
title="CLOSED FIXED - Kernel "NULL pointer dereference" with MST monitor on HSW"
href="show_bug.cgi?id=97666">bug #97666</a> for
dmesg without the commit.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>