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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 - Display corruption on multi-monitor when the largest panel is not on the left (and amdgpu.dc=1)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108907">108907</a>
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<th>Summary</th>
<td>Display corruption on multi-monitor when the largest panel is not on the left (and amdgpu.dc=1)
</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>URL</th>
<td>https://imgur.com/a/DIqAfu1
</td>
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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>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/AMDgpu
</td>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
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<th>Reporter</th>
<td>kdebugs@funkster.org
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<pre>After doing an update (Arch) on 2018-11-27 (including mesa (18.2.4-1 ->
18.2.5-1), linux (4.19.2.arch1-1 -> 4.19.4.arch1-1)) I found I had corruption
on the center monitor of a PLP setup. Further investigation found that the
corruption does not occur if the large panel is configured to be on the left
(both using XFCE display settings, and the equivalent in KDE). This was
replicated on both my installed OS and a Manjaro 18.0 live USB.
Corruption takes the form of every other line being offset by an increasing
amount, although it only starts part-way down the monitor. Side monitors are
not affected.
<a href="https://i.imgur.com/0pQMznF.jpg">https://i.imgur.com/0pQMznF.jpg</a>
Probably important details:
- Arch / XFCE / XDE / lightdm
- AMDGPU open source drivers (Sapphire Radeon RX580)
- 3 monitors in PLP: sidecars are 1680x1050 (but turned so they're vertical),
center is 2560x1600. Left-hand sidecar is on HDMI, other two are DP.
- Corruption DOESN'T happen if the large monitor is placed on the left! Nor
does it happen at the login screen (which doesn't have any screen rotation and
probably also has the big panel on the left)
- Corruption DOESN'T happen if I reduce the resolution of the center screen to
2048x1280 (but obviously that's not a solution)
- Corruption DOESN'T happen if I pass amdgpu.dc=0 to the kernel
- Corruption DOES happen on KDE (tested with Manjaro KDE live USB) as long as
you arrange the monitors in the same way
Here's a paste of the pacman.log from the day it all went wrong:
<a href="https://pastebin.com/H3i5LuzU">https://pastebin.com/H3i5LuzU</a>
or
<a href="https://hastebin.com/dixemisepo.php">https://hastebin.com/dixemisepo.php</a>
Thank you for your attention.</pre>
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