It's very likely you have the pata driver blacklisted.
sudo rm -f /etc/modprobe.d/blacklist-pata
sudo update-initramfs -u
That should resolve it.
Also, please let the maintainers handle confirmed or not. You haven't
confirmed anything other than assumptions.
** Changed in: linux-source-2.6.19 (Ubuntu)
Status: Confirmed => Needs Info
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Kernel becomes idle during boot process
https://launchpad.net/bugs/71318
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