(2012-04-06 19:48)wsnipex Wrote: if you have dirty region rendering enabled, v-sync on and still get very high cpu load(in my case 100% on 1 core) you can try downgrading the ati driver to 11.12 or 11.11. so far this issue has only been reported with ati hd 4000 series and catalyst >12.2, possibly it also affects other ati hardware. Worth a shot, if you are out of ideas. If you try it, plz report back with results.
I had the same problem as nouniques. xbmc.bin kept using 100% cpu when it idles, even after enabling v-sync and dirty regions. I just tried your suggestion and I can confirm that it works . I downgraded to fglrx 8.850 (Catalyst 11.5) and everything works fine again now.