Comment 13 for bug 63937

I guess this problem is caused by the uevent (i.e. the new Udev framework in the kernel space), I have tried to compile a 2.6.16.30 official vanilla kernel which is patched with uevent but without significant changes in the PATA/SATA drivers source, and this problem is reproducedable in this case, which means the new udev in the kernel (uevent) may cause this problem, (maybe the laptop's SATA drive is recognized as a removable device by uevent/udev)
I suggestion is, don't upgrade to edgy if not neccessary.