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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 - [Dualscreen] "No signal" issues when booting with DVI and HDMI screens both plugged in"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108934">108934</a>
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<th>Summary</th>
<td>[Dualscreen] "No signal" issues when booting with DVI and HDMI screens both plugged in
</td>
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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
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<th>Component</th>
<td>DRM/AMDgpu
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>laurent.pointecouteau@gmail.com
</td>
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<pre>I'm using a AMD R9 380 video card on Arch Linux (with kernel 4.19.4 and the
latest `mesa` package installed), and since several weeks, dualscreen has a
buggy behavior. My Samsung TV displays "no signal" after booting while plugged
in my computer (using a HDMI cable), and when trying to switch display modes
using the GNOME control center (or the Super+P shortcut), my Iiyama ProLite
B2475HDS DVI monitor gets randomly disabled and displays "no signal" too
without ever recovering, forcing me to hard reboot.
I've tried to apply a kernel patch as suggested in <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTOURBUG - 4.19 amdgpu Tonga powerplay regressions"
href="show_bug.cgi?id=108704">bug #108704</a>, but it only
removed the amdgpu-related error messages from dmesg, without fixing the
dualscreen issues. Since then, I've found two workarounds:
- putting the system to sleep then waking it up seems to restore normal
functionality;
- when booting with the HDMI cable unplugged, after plugging it in, screen
switching is not buggy anymore.
My setup does not allow me to safely downgrade to an older kernel, but I can
confirm that the screen settings started to exhibit this buggy behaviour only
recently.</pre>
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