fglrx blocking Xorg on logout

If you are running Kubuntu Hardy with the flgrx drivers and logging out does not work due to the Xorg process locking up at 100% of CPU usage, you should thank Stefan Carslöv for tracking down the issue to /etc/ati/authatieventsd.sh being unproperly configured, you need to change

XDM_AUTH_MASK=/var/lib/xdm/authdir/authfiles/A$1*

to:

XDM_AUTH_MASK=/var/run/xauth/A$1*

Performance of radeon free drivers

The other day, i updated to KUbuntu gutsy and saw it ships a free graphics driver for my Ati X300 card (r300 based). I switched to it from the non-free driver but i have went back.

Why? Well, actually it does work, but it is slow, for example, hiding and showing again a normally sized ktuberling, takes around 180ms on the fglrx driver while it takes 550ms on the radeon driver.

But well, after all, as far as i remember they reverse engineered the driver, so i should congratulate the people doing it, it's a bit slow but works, so people that NEED a free driver or where the non-free one does not work can actually use the card now, thanks :-)

This is with driver 6.7.194 which i would say is latest released version.

UPDATE: Setting the driver to use EXA makes it go as fast or faster than fglrx driver in this scenario of swapping ktuberling windows, now i ask me why this is not the default :-S

UPDATE 2: Now blogger.com newsticker makes CPU go to 100% on both konqueror and firefox. I think i'll wait for the next iteration of the driver.