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<body><span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
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<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - MST configuration breaks after resume with monitor switched to different source"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112400">bug 112400</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>NEEDINFO
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<td style="text-align:right;">i915 features</td>
<td>
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<td>display/DP MST
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<td style="text-align:right;">Whiteboard</td>
<td>
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<td>Triaged
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - MST configuration breaks after resume with monitor switched to different source"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112400#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - MST configuration breaks after resume with monitor switched to different source"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112400">bug 112400</a>
from <span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span></b>
<pre>(In reply to Simon Richter from <a href="show_bug.cgi?id=112400#c0">comment #0</a>)
<span class="quote">> I use a MST based dual monitor setup where the first monitor in the chain
> has multiple inputs and allows me to switch between input sources.
>
> When switching away from my Linux box, there is a good chance that
> afterwards the configuration will be invalid, and after switching back, no
> picture will be shown.
>
> I usually hibernate the machines at night, and resuming with the monitor
> switched to the other source always triggers this condition (while switching
> away during normal operation only has a high probability).
>
> Hibernating again and making sure to boot up with the monitor set to the
> right source does not fix the problem -- the firmware correctly shows the
> logo on both monitors, a text mode screen with a blinking cursor is shown
> during resume, then the invalid configuration is reloaded.
>
> Attached kernel log is with a Debian standard kernel,
>
> Linux debian 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u1 (2019-09-20)
> x86_64 GNU/Linux
>
> - Normal boot
> - X start
> - hibernate
> - resume
> - X shutdown
> - X restart</span >
Which platform is this? I couldn't find it from the kernel log.</pre>
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