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

[bugzilla-daemon]

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

Alex Deucher  changed:

   What|Removed |Added

  Component|Mesa core   |DRM/Radeon
 QA Contact|mesa-dev@lists.freedesktop. |
   |org |
   Assignee|mesa-dev@lists.freedesktop. |dri-devel@lists.freedesktop
   |org |.org
Product|Mesa|DRI
Version|11.2|unspecified

--- Comment #1 from Alex Deucher  ---
The driver is not loaded in the logs attached.  Please attach a copy of your
xorg log and dmesg output with the firmware installed.  Note that if you are
using an initrd, you need to update that with the firmware as well.

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

[bugzilla-daemon]

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@lists.freedesktop.org
  Reporter: sounizan-n...@yahoo.com
QA Contact: mesa-dev@lists.freedesktop.org

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