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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 - 4.18.0-rc6 amdgpu framebuffer problems with DisplayPort"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107393">107393</a>
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<th>Summary</th>
<td>4.18.0-rc6 amdgpu framebuffer problems with DisplayPort
</td>
</tr>
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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)
</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
</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>lkd-fdo@sky-haven.net
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=140848" name="attach_140848" title="combined kernel dmesg for two boot sessions, one in 4.17.0 and the other in 4.18.0-rc6">attachment 140848</a> <a href="attachment.cgi?id=140848&action=edit" title="combined kernel dmesg for two boot sessions, one in 4.17.0 and the other in 4.18.0-rc6">[details]</a></span>
combined kernel dmesg for two boot sessions, one in 4.17.0 and the other in
4.18.0-rc6
On kernel 4.17.0, amdgpudrmfb functions correctly; taking the fb from efifb
On kernel 4.18.0-rc6 (and previous), the framebuffer proper doesn't start;
monitor doesn't get a valid display signal. If I log in and blind-start a
Wayland compositor (sway in my case), the display gets a desktop and things
work normally. Once I exit out back to FB, the display is blanked.
Everything works normally if I connect the monitor with HDMI instead.
This was a problem with 4.18.0-rc5 as well. I was pointed to the patch at
<a href="https://lists.freedesktop.org/archives/amd-gfx/2018-July/023920.html">https://lists.freedesktop.org/archives/amd-gfx/2018-July/023920.html</a> and
applied it to 4.18.0-rc5, but it had no effect on behavior.
GPU: Vega64
Monitor: Acer XR341CK</pre>
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