Comment 161 for bug 330824

@iamringo: I got other frequent random lockups also with the stock kernels (both 2.6.28-11 and -12), possibly related to ext4 (I suspect the mlocate update was causing some). But I've not had a single one in four weeks using the 2.6.30 vanilla kernels and they've been very stable. IMO it's definitely worth installing 2.6.30 (if you don't want to build it from source, you can install it either from the karmic repository or from the vanilla builds at http://kernel.ubuntu.com/~kernel-ppa/mainline/).