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1440x900 works now, i'm unable to switch to any other resolution while running X11 but i guess that's just broken in this beta. Thanks for help.
In ubuntu i'm still unable to switch to anything higher than 1280x800.
Hmmm, i'm able to switch to 1280x800 but not to 1440x900 which is my MBP's native resolution. I also tried 8 bit mode but that didn't work either....
I too experience this problem, wild fluctuating cpu usage. On my MBP CD 2.0ghz 2GB. Ram management seems to be improved.