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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 - RX580: screen turns black or flickers until forced reconfiguration"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110217">110217</a>
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<th>Summary</th>
<td>RX580: screen turns black or flickers until forced reconfiguration
</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)
</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>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>numzer0@yandex.ru
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=143754" name="attach_143754" title="dmesg output">attachment 143754</a> <a href="attachment.cgi?id=143754&action=edit" title="dmesg output">[details]</a></span>
dmesg output
I have a Radeon RX560 and VGA monitor (with broken EDID) connected via a cheap
HDMI-to-VGA converter (with its own broken EDID).
The system starts up normally. During boot up, it should change display
resolution as specified in the kernel command line (`video=1280x1024-32@75`,
monitor native). Screen turns black instead, and resolution remains unchanged.
But after I plug HDMI out and in, the monitor gets new resolution and shows
console login prompt, as expected. (X isn’t configured to start at bootup).
Then, when I `startx`, it chooses the same resolution but wrong frequency (85
Hz, too much for my monitor). That’s probably due to converter supplying the
EDID. After I run `xrandr --rate 75`, it switches to the correct mode.
I wouldn’t even mention such small nuisance, but if I specify exactly the same
mode (as reported by `xrandr --verbose`) explicitly (as a `Modeline`), it works
but flickers, despite the `TearFree` option enabled. Moreover, when the monitor
is turned off and then on, it wakes up in the same mode *but flickers.*
Changing mode back and forth (`xrandr --output HDMI-A-0 --preferred ; xrandr
--rate 75`) helps.
I usually have `compton` running. Without it, flicker is tolerable but still
present.
OS: Arch Linux
Kernel: Linux 5.0.1-arch1-1-ARCH
X driver: xf86-video-amdgpu 19.0.0-1</pre>
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