https://bugs.freedesktop.org/show_bug.cgi?id=32687
--- Comment #1 from nguyenthetoan@gmail.com 2010-12-27 12:24:25 PST --- (In reply to comment #0)
I have an integrated AMD760G graphic card. I use the latest r600g driver from xorg-edgers package repository for ubuntu Lucid.
My most important OpenGL software is XBMC. It has three video renderers: Software, ARB or GLSL. I notice (using the debug information of XBMC) that the Software renderer is actually the fastest one, then ARB and finally GLSL. I guess something is not well optimized in r600g with regard to video rendering. This is especially true for 1080p video (sometime I get only 12-16fps using OpenGL renderers while CPU usage is still only 50%. Software renderer could do 24fps with 100% CPU.).
FYI, I also have another similar desktop, but with ATI X1650 PRO card. On this machine, using the r300g driver, the GLSL renderer is fastest (also similar to ARB renderer) and is faster than the Software renderer. So, r300g is well optimized with regard to video rendering.
I file this bug hoping the developers could spare sometime optimize r600g for video rendering.
Thanks a lot
I forgot to say, I have an AMD athlon 64 X2 dual-core CPU 4800+ (2.5GHz).