Rendering slows down to crawl for <1sec every 30 secs. It affects everything: 3d applications, video playback, 2d drawing (e.g. kpatience), probably because of the compositing. I suspect this is caused by r600g, because my other machine running the same distribution but r300g doesn't have this problem. Current 7.12-dev (git-2cd7e5b) seems to slow down less than 7.11, but the effect remains and it is very noticeable.
Please attach your xorg log, dmesg output, and glxinfo output. If it happens every 30 seconds, it may be your desktop environment polling the connectors on your video card to see what is connected. They shouldn't be doing that as the driver handles that internally and generates hotplug events automatically.
Created attachment 55083 [details] dmesg Hmmm... I haven't noticed there are so many call traces in dmesg. Disturbing.
Created attachment 55084 [details] Xorg.0.log
Created attachment 55085 [details] glxinfo
Does disabling output polling in your desktop environment fix the issue? Try killing upowerd or knotify.
(In reply to comment #5) > Does disabling output polling in your desktop environment fix the issue? Try > killing upowerd or knotify. I killed both, but the issue remains. How can I disable output polling in kde4?
I'm not sure off hand. You might try some of these instructions: http://linux-tipps.blogspot.com/2009/03/fixing-high-latency-with-kde4-display.html Alternatively, you could try starting just X (no desktop) in single user mode and see if you are still getting the issue.
Now I experimented a bit and found the culprit: the dd-wrt control panel opened in firefox reloads itself every 30 seconds. It seems that page loading (or rendering?) is a real resource hog in firefox, even though this is not a slow machine (see (9) in rfc1925). Closing as notourbug.
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