[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

--- Comment #7 from Neok <sounizan-neok at yahoo.com> ---
> From: "bugzilla-daemon at freedesktop.org" <bugzilla-daemon at freedesktop.org>
>To: sounizan-neok at yahoo.com 
>Sent: Thursday, June 23, 2016 3:40 AM
>Subject: [Bug 96634] Mesa or libGL very slow rendering with kabini vga card

>Comment # 6 on bug 96634 from Michel Dänzer 
>If using the radeon kernel driver instead of amdgpu doesn't help, you can try
>Option "ShadowPrimary" in /etc/X11/xorg.conf .

Well Done! At Last! I tried so many ideas before I could narrow down the
conditions that created the problem. And now you have given me the solution!

Thank you!

I tried installing the radeon driver but it didn't help, so I created this
file /etc/X11/xorg.conf/20-radeon.conf, from ArchLinux wiki:

Section "Device"
    Identifier  "Radeon"
    Driver "radeon"
    Option "AccelMethod" "glamor"
    Option "DRI" "3"
    Option "TearFree" "on"
    Option "ShadowPrimary" "on"
    Option "ColorTiling" "on"
    Option "ColorTiling2D" "on"
EndSection

Some options may not be needed but Option "ShadowPrimary" "on" definitely
fixes the problem. This problem exists in every major distro I tried 

except Puppy Linux, which does not include kabini firmware.

I will report this to Void Linux but other distro developers may need to
be informed about this, as I have seen a number of bug reports complaining
about symptoms similar to what I have experienced.

Thanks again!


--
Best Regards
Neoklis - Ham Radio Call:5B4AZ
http://www.5b4az.org/

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