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AMD Athlon 64 X2 3800+ running on Ubuntu 10.04 amd64. I'm running the CPU miner only on one core, because I end up with 100% CPU usage on the other core if I run pocblm 
I had the same issue, using an Intel Core 2 Duo E8400 and a Nvidia 8800GT GPU on ubuntu 10.04 64-bit.
I tried tossing a spare harddrive I had laying around in my PC and installed Ubuntu 10.10, the result when running poclbm = 0-3% CPU.
I can see that the Nvidia driver in my 10.04 is version 195.36.24 which is quite old, so I'm guessing that's the problem. Try 10.10 on a spare harddrive or an old usb key you have lying around to see if that solves your problem as well
