Comment 21 for bug 148466

As a ray of hope on this - I've had the same problem on Fedora 8 (see earlier notes), but Fedora put in a kernel option to work round the problems in the ATA driver.

Fedora 9 was released last week with a 2.6.25 kernel, and this boots on my 2500 without any special kernel flags, so it seems that at least the upstream kernel has a fix in place for this issue, and that hopefully it will permeate down to the next release of Ubuntu.