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

--- Comment #7 from Neok sounizan-neok@yahoo.com ---

From: "bugzilla-daemon@freedesktop.org" bugzilla-daemon@freedesktop.org To: sounizan-neok@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/