I have a nvidia GeForce 6150 LE and face the same problem after upgrading to 
12.04. It was working fine in 11.10, but now compiz takes 100% and after a 
couple of minutes segfaults. In dmesg I see:
Apr 28 22:42:33 fin kernel: [  866.135660] compiz[1601]: segfault at af079c00 
ip 034cd4c0 sp bfd487e0 error 4 in libnvidia-glcore.so.295.40[227c000+1bc0000]
Apr 28 22:43:27 fin kernel: [  920.095632] compiz[2547]: segfault at 0 ip   
(null) sp bf90705c error 4 in libX11.so.6.3.0[110000+130000]
Apr 28 22:44:32 fin kernel: [  985.726420] compiz[2866]: segfault at af27ac00 
ip 023824c0 sp bff27d30 error 4 in libnvidia-glcore.so.295.40[1131000+1bc0000]

Selecting nouveau seems to work around the problem.

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  Unity 3d will not work anymore with nvidia 6150

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