it`s from xscreensaver-5.08. Screensaver IFS also looks strange, it`s like frame rates of parts of the screen are different and very low... I don`t know how to describe this :).
Created attachment 25742 [details] xorg.log
Can you attach a screenshot of the problem?
Created attachment 25745 [details] Galaxy screenshot
Does this issue occur with the preferred ati driver (xf86-vide-ati)? If so, please move this to the Driver/Radeon component. Development of radeonhd has pretty much halted and development focus is on the ati driver. Please see http://www.x.org/wiki/radeonhd If the issue does not exist in the ati driver (or if there is no response to this message), this bug will be closed as WONTFIX unless someone contributes a patch.
there are no such problem with xf86-video-ati, it has some flickering but much better
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.