On 08/08/15 22:53, Jörg-Volker Peetz wrote:
Maybe you could also play with
Option "AccelMethod"
in /etc/X11/xorg.conf, with can either be "EXA" or "glamor" (default for R300,
see man radeon(4)).
Compare these benchmarks: http://www.phoronix.com/vr.php?view=MTYzMDM
Interesting - and very appealing benchmark results! I'd noticed a mention of glamor in the Radeon driver man page, but assumed that, since it was the default only on Tahiti and later, it probably didn't offer advantages for older chipsets (or might be unstable).
I've tried it and, unfortunately, with 'Option "AccelMethod" "glamor"', Xorg won't start. It reports "(EE) GLSL link failure" and "Failed to link: error: shader uses too many input components (44 > 40)".
It looks like this might have been patched already in upstream: https://bugs.freedesktop.org/show_bug.cgi?id=75709 Thanks for the suggestion - perhaps in future I can use it too. :) Chris