[Mesa-dev] [Bug 96634] Mesa or libGL very slow rendering with kabini vga card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96634

            Bug ID: 96634
           Summary: Mesa or libGL very slow rendering with kabini vga card
           Product: Mesa
           Version: 11.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: sounizan-neok at yahoo.com
        QA Contact: mesa-dev at lists.freedesktop.org

Created attachment 124663
  --> https://bugs.freedesktop.org/attachment.cgi?id=124663&action=edit
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.

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