Created attachment 15954 [details]
Xorg.0.log

I'm using the radeon module from git (commit f72a4b8) with a 1920x1200 display connected through DVI to the onboard 690G on my Gigabyte GA-MA69GM-S2H board.

I'm running into a problem that might be the same as the first one described in bug #15175 (in all the below statements "1 second" is an average time, the actual times seem to be quite randomly between 0.1 and 10 seconds):

My working environment consists of FVWM with 3x3 virtual windows and open xterms.

Very rarely the screen turns black for 1 second.

This happens more often when using Jin (Java chess server client).

But when running liferea it's is completely unusable, since there's more or less always one second picture, one second blank screen, etc.

And in this cycle roughly every 10th picture (also an average number, might happen twice in a row or not for 20 pictures) in liferea is corrupted in an interesting way:
A vertical block consisting of roughly the left 200 pixel of liferea is displayed semi-transparently (with the background shining through), and the same block is also shown semi-transparently right of the liferea window (where only background is).

In Iceape (Debian-rebranded Seamonkey AKA the-browser-formerly-known-as-Mozilla) there are no general problems except for some pages (e.g. when I had the flash plugin installed I had the "liferea feeling" when viewing videos, and one page that places many location points on a Google map also has the same problem during placement of the point).