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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 - Dual-monitor desktop environment crash with certain monitor positions"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111372">111372</a>
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<th>Summary</th>
<td>Dual-monitor desktop environment crash with certain monitor positions
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>Drivers/Gallium/radeonsi
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
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<th>Reporter</th>
<td>theodorettshaw@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>dri-devel@lists.freedesktop.org
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<pre>Created <span class=""><a href="attachment.cgi?id=145032" name="attach_145032" title="Monitor placement crash/working cutoff">attachment 145032</a> <a href="attachment.cgi?id=145032&action=edit" title="Monitor placement crash/working cutoff">[details]</a></span>
Monitor placement crash/working cutoff
There's an issue with certain desktop environments crashing on startup when the
monitors of a multi-display system are in certain positions. In my case, I have
two monitors, and my desktop environment crashes with the error
cinnamon: ../src/gallium/drivers/radeonsi/si_state_viewport.c:239:
si_emit_guardband: Assertion `left <= -1 && top <= -1 && right >= 1 && bottom
<span class="quote">>= 1' failed.</span >
when my secondary monitor is positioned to the left of the primary monitor. An
example placement can be seen in the attached image. This is roughly the
cutoff; moving the secondary monitor, the Philips, any farther left and
restarting the DE will result in a crash. Keeping it further right and
restarting the DE results in no issues. The secondary monitor can be either
above or below the primary monitor with the same results. This error also
occurs if the secondary monitor is too far left when the DE starts on system
startup. Switching which monitor is the primary and secondary results in the
same issue, with a crash if the new secondary is too far left.
I'm using Linux Mint 19.2, Cinnamon 4.2.3, and kernel version 5.0.0-23-generic,
though I've tried several different kernel versions. I'm using an RX480. The
issue has been confirmed by others at
<a href="https://github.com/linuxmint/cinnamon/issues/8754">https://github.com/linuxmint/cinnamon/issues/8754</a> and a very similar and likely
linked issue at <a href="https://bugs.launchpad.net/ubuntu/+source/cinnamon/+bug/1837087">https://bugs.launchpad.net/ubuntu/+source/cinnamon/+bug/1837087</a>
. glxinfo output can be found at <a href="https://pastebin.com/RGnAR320">https://pastebin.com/RGnAR320</a> and I'm happy to
provide any other information needed, though I may need some pointers on
something like recompiling Mesa in debug mode and getting a trace stack.</pre>
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