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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 - Mesa or libGL very slow rendering with kabini vga card"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96634">96634</a>
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<th>Summary</th>
<td>Mesa or libGL very slow rendering with kabini vga card
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>11.2
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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
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Mesa core
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>sounizan-neok@yahoo.com
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=124663" name="attach_124663" title="dmesg and Xorg log">attachment 124663</a> <a href="attachment.cgi?id=124663&action=edit" title="dmesg and Xorg log">[details]</a></span>
dmesg and Xorg log
Hi
I have a Compulab FitPC4 computer with AMD G-Series Jaguar @2.0GHz CPU and
Radeon HD 8400E GPU and latest Void Linux distro. I have noticed that rendering
speed of Cairo is very much slower on this machine than on my laptop, of
similar specs but different hardware. I tried various Linux distros including
Debian, Arch and Mint, but all with the same problem. Then I tried a Puppy
Linux LiveCD and surprisingly Cairo rendering was a lot faster.
Eventually I found that the reason is Puppy Linux does not include KABINI
firmware blobs so I tried removing these from my Void Linux installation and
running it without them. The result was that the linux console went blank but I
was able to log in blind and start my Xorg desktop. Sure enough, Cairo
rendering became a lot faster. Unfortunately since the console goes blank, I
had to reinstate the KABINI firmware and the slow down returned. The driver I
use is the xf86-video-amdgpu.
I felt I should persist and eventually found that if I install the
catalyst-libs-15.12 or nvidia-libs-364.19, which replace libGL, then Cairo
rendering again becomes much faster. I therefore suspect that the mesa/libGL
combination slows down Cairo rendering, if KABINI firmware blobs are loaded by
the system. And with the slow down comes a heavy increase in processor
workload, which probably means that hardware acceleration is disabled when
KABINI blobs are loaded. I attach dmesg and xorg log.</pre>
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