Bug#617624: xserver-xorg-video-radeon: serious performance regression with 6.14 versions of driver and R480 chip (X850 XT)

Michel Dänzer daenzer at debian.org
Fri Mar 11 08:57:32 PST 2011

On Don, 2011-03-10 at 20:26 +0000, Mike Brodbelt wrote: 
> On 10/03/11 13:57, Michel Dänzer wrote:
> >> Eterm - though I'm of the opinion that the terminal emulator isn't
> >> actually relevant.
> >
> > Well, if it uses core X11 fonts, then text is rendered in software,
> > which could certainly explain at least some of the issues. If you're
> > using a non-anti-aliased font in the terminal, does switching to an
> > anti-aliased one improve terminal performance?
> I've tried this again now with Xterm, using "xterm -fa 'Mono' -fs 8" as 
> the launch command line, which uses an anti-aliased font. There doesn't 
> appear to be any improvement.

Odd. Maybe it's still falling back to software rendering for some other

> > Then I don't suppose Option "ColorTiling" "off" helps, as I don't think
> > that could have been enabled with 2.6.32.
> Aha. That appears to have cured it.

Hmm, but I just double-checked, and tiling should only be enabled with
kernel >= 2.6.36. Why didn't 2.6.32 work better?

Have you tried if compositing works better?

Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer

More information about the xorg-driver-ati mailing list