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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - RX480 with multiple HDMI ports shows monitor connected to unused port when using amdgpu.dc=1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106846">106846</a>
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<th>Summary</th>
<td>RX480 with multiple HDMI ports shows monitor connected to unused port when using 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>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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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
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<th>Reporter</th>
<td>tim@timcarr.me
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<p>
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<pre>Created <span class=""><a href="attachment.cgi?id=140060" name="attach_140060" title="'xrandr -q' output with and without amdgpu.dc enabled.">attachment 140060</a> <a href="attachment.cgi?id=140060&action=edit" title="'xrandr -q' output with and without amdgpu.dc enabled.">[details]</a></span>
'xrandr -q' output with and without amdgpu.dc enabled.
Card is an ASUS DUAL-RX480-04G. When booting with amdgpu.dc=1, as is default on
4.17+, the system shows a monitor on both HDMI ports when only one is
connected. This causes a low-resolution login screen and requires disabling the
non-existent monitor to prevent some windows from being opened off screen.
Attached is the 'xrandr -q' output from booting with and without amdgpu.dc
enabled. Behavior is the same regardless of which HDMI port is used.</pre>
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