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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 - RX 580 and 5K displays, bandwidth validation failed with multiple monitors"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110780">110780</a>
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<th>Summary</th>
<td>RX 580 and 5K displays, bandwidth validation failed with multiple monitors
</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>All
</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
</td>
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<th>Reporter</th>
<td>linuzel@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>I have been facing an issue with my 5K display (iiyama ProLite XB2779QQS-S1).
It works fine as long as it is the only active monitor, as soon as I activate
another monitor the main one (5k) can't display more than 4k.
Debug using "echo 0x4 > /sys/module/drm/parameters/debug" show this :
mai 23 09:01:22 bureau-gael /usr/lib/gdm3/gdm-x-session[3465]: (EE) AMDGPU(0):
failed to set mode: Invalid argument
mai 23 09:01:22 bureau-gael kernel: [drm:dce112_validate_bandwidth [amdgpu]]
dce112_validate_bandwidth: Bandwidth validation failed!
I disabled the check by forcing is_display_configuration_supported to return
true in dce_calcs.c and it works fine.
I tried a lot of kernel (includig drm-tip and 5.2-rc1) and they all have the
same issue.
My custom kernel with no validation is based on Ubuntu's 5.0.0-15-generic.
If I can help by providing more logs or test something ask and I will do my
best.</pre>
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</p>
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