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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 - Lenovo L460: Hard lockup with external monitors"
href="https://bugs.freedesktop.org/show_bug.cgi?id=95471">95471</a>
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<th>Summary</th>
<td>Lenovo L460: Hard lockup with external monitors
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (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
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>direx@betriebsdirektor.de
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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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=123868" name="attach_123868" title="dmesg with intel-drm-nightly">attachment 123868</a> <a href="attachment.cgi?id=123868&action=edit" title="dmesg with intel-drm-nightly">[details]</a></span>
dmesg with intel-drm-nightly
My Skylake Lenovo L460 hard freezes randomly if multiple monitors are
connected. With 4.6 mainline it is not as bad as with intel-drm-nightly. When
using only the integrated display (eDP1) everything runs smoothly without
lockup issues.
The monitors I have connected right now are conntected to the Ultra Dock
(DVI+HDMI), which comes with a Synaptics VMM2322 DP switch (FW: 2.30.000).
CPU: i5-6200U
Kernel: 4.6 with intel-drm-nightly
BIOS: 1.14
xf86-video-intel: 1:2.99.917+645+g88733a7-1
libdrm: 2.4.68-1
xorg-server: 1.18.3-1
Arch Linux
Ever since the watermark issues have been fixed (#89055) I am also getting FIFO
underruns:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
I don't know if this could be related to the lockups. Unfortunately I cannot
get a crash dump, as the entire machine locks up hard. Prior to the lockup
`drm/card0/error` is empty.</pre>
</div>
</p>
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