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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 - Blank screen and dmesg errors with two external monitors"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93208">93208</a>
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<th>Summary</th>
<td>Blank screen and dmesg errors with two external monitors
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
</td>
</tr>
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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>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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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>bartolinidb@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>I am on a Thinkpad T450, if I connect a single external monitor, either via
miniDP or VGA, everything works fine.
If I connect both monitors, all output disappears and the only way to restore
is to go back to a text console and restart the display manager.
In dmesg, I get a lot of these messages:
[drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
I found other bugs that report the same error message, but they seem to be
triggered by different conditions.
The two monitor used to work on a previous kernel (I'm not sure what version,
probably before 4.2).
Additional information follows:
$ uname -a
Linux davide 4.4.0-040400rc3-generic #201511300321 SMP Mon Nov 30 03:23:36 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux
$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated
Graphics (rev 09)
$ lsmod | grep i915
i915 1204224 9
i2c_algo_bit 16384 1 i915
drm_kms_helper 135168 1 i915
drm 360448 10 i915,drm_kms_helper
video 40960 2 i915,thinkpad_acpi</pre>
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</p>
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