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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 - Kernel "NULL pointer dereference" with MST monitor on HSW"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97666">97666</a>
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<th>Summary</th>
<td>Kernel "NULL pointer dereference" with MST monitor on HSW
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>XOrg git
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>kirill@shutemov.name
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=126335" name="attach_126335" title="dmesg with drm.debug=0xe">attachment 126335</a> <a href="attachment.cgi?id=126335&action=edit" title="dmesg with drm.debug=0xe">[details]</a></span>
dmesg with drm.debug=0xe
Steps to reproduce:
1. Boot machine (Haswell, also saw on Skylake) 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.
4. Switch to linux console (C-A-F1) and back. It brings the monitor back alive.
5. Switch to linux console again. Kernel crashes.</pre>
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