<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Flickering and artifacts on dual 4K displays from RX 570"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109359">109359</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Flickering and artifacts on dual 4K displays from RX 570
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/AMDgpu
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>venemo@msn.com
</td>
</tr></table>
<p>
<div>
<pre>There are two Dell U2718Q 4K monitors connected to a Sapphire Pulse RX 570 ITX
card, one using the DisplayPort output and the other using the HDMI output.
There is a visible flickering artifact on both displays. There is no problem
when only a single display is connected.
Searching online yields a couple of results that suggest a workaround: manually
increasing the shader and/or memory clock of the GPU. On the RX 570 the
following commands can get rid of the problem:
echo "manual" > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo "2" > /sys/class/drm/card0/device/pp_dpm_mclk
echo "5 6 7" > /sys/class/drm/card0/device/pp_dpm_sclk
However, I believe the amdgpu driver should be able to figure out the correct
necessary clock settings on its own. The problem exists in Linux 4.19 and
5.0-rc1 as well.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>