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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 - Bad DisplayPort enumeration and wrong refresh rate with Hawaii chip"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109384">109384</a>
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<th>Summary</th>
<td>Bad DisplayPort enumeration and wrong refresh rate with Hawaii chip
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</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
</td>
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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
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<th>Reporter</th>
<td>fabio0x@keemail.me
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=143150" name="attach_143150" title="Xorg.0 log with DC off">attachment 143150</a> <a href="attachment.cgi?id=143150&action=edit" title="Xorg.0 log with DC off">[details]</a></span>
Xorg.0 log with DC off
I'm running Solus KDE with kernel 4.20.2 but I've had these issues since kernel
4.19. Here's the list of issues with AMDGPU DC enabled:
- With Solus' default kernel flags I have wrong DisplayPort enumeration,
meaning that I get DisplayPort-1 when I turn on the computer, and then
DisplayPort-2 when I get my monitor to sleep and then I wake it up.
- If I put my computer on sleep (suspension) and then wake it up, I cannot set
a usable refresh rate. This means I actually get 40 Hz when I set 60, and 45 Hz
when I set 74 (yeah, I have a bit of screen "overclocking". That's how I found
DisplayPort enumeration is wrong).
- I get microstuttering, particularly noticeable when I drag windows around.
Now, all these issues are non existant if I set the amdgpu.dc=0 kernel flag.
Also, DisplayPort number is DisplayPort-0 under any circumstances.
❯ inxi -G
Graphics: Device-1: AMD Hawaii PRO [Radeon R9 290/390] driver: amdgpu v:
kernel
Display: x11 server: X.Org 1.20.3 driver: amdgpu,ati unloaded:
fbdev,modesetting,vesa
resolution: 1920x1080~60Hz
OpenGL:
renderer: AMD Radeon R9 200 Series (HAWAII DRM 3.27.0
4.20.2-107.current LLVM 7.0.0)
v: 4.5 Mesa 18.3.1</pre>
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