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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 - Loss of multi-display support when using USB-C Travel Hub after suspend."
href="https://bugs.freedesktop.org/show_bug.cgi?id=111322">111322</a>
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<th>Summary</th>
<td>Loss of multi-display support when using USB-C Travel Hub after suspend.
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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>sellis@redhat.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>
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<p>
<div>
<pre>Hardware
- Lenovo T480s
- Lenovo USB-C Travel Hub
- Dell 24" Monitor
OS
- Fedora 29
- xorg-x11-drv-intel-2.99.917-42.20180618.fc29.x86_64
- Kernel 5.1.20-200.fc29.x86_64
I have a HDMI monitor, USB keyboard/mouse and network cable connected to the
Lenovo USB-C travel hub at home.
Sometime when I connect this after the laptop has been suspended I get the
following errors in the system log, and dual monitor support no longer works.
Aug 08 09:56:47 t480s kernel: [drm:intel_dp_start_link_train [i915]] *ERROR*
failed to enable link training
Aug 08 09:56:47 t480s kernel: [drm:intel_mst_pre_enable_dp [i915]] *ERROR*
failed to allocate vcpi
Aug 08 09:56:47 t480s kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* CPU pipe B FIFO underrun
Aug 08 09:56:47 t480s kernel: [drm:intel_mst_pre_enable_dp [i915]] *ERROR*
failed to allocate vcpi
Once I've seen this error I can only run a single display
- Joined displays don't work
- Mirroring doesn't work
I'm still running Xorg due to some other Wayland issues and I can see the
following in my logs when I try and enable my normal joined display
Aug 08 11:24:31 t480s /usr/libexec/gdm-x-session[2657]: (II) modeset(0):
Allocate new frame buffer 3840x1200 stride
Aug 08 11:24:31 t480s /usr/libexec/gdm-x-session[2657]: (EE) modeset(0): failed
to set mode: Invalid argument
Currently my only fix is to reboot the system.</pre>
</div>
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