I was one of the original posters of this bug.  When I installed
Intrepid (by dist-upgrade) on my AMD64 machine, I was delighted to
discover that the problem went away.  My SATA DVD-RW drive is now
completely and smoothly supported.

The pci=nomsi option turns off a type of memory access used primarily by
PCI-express cards.  For some reason I do not completely understand,
using the msi-type memory access conflicts with kernel recognition of
SATA drives, for kernels between 2.6.16 (I think) and 2.6.27.  Using the
pci=nomsi switch is completely safe and harmless.

However, this bug seems to be fixed in the 2.6.27 kernel.  Since you
upgraded your installation in-place, you may not have this kernel active
on your computer.  Check the results of 'uname -r' to see which kernel
you are using.  I had the 2.6.27 kernel "kept back" when I did my
upgrade, because I had customized /boot/grub/menu.lst, and I wanted to
keep the customization.  If you find that you don't have the 2.6.27
kernel active, try running "sudo update-grub," and make sure to choose
the "package maintainer's version" when prompted.  This will overwrite
your /boot/grub/menu.lst, so you might want to back it up first (you
will lose your customizations).  If this doesn't get your 2.6.27 kernel
installed, or if you already have it, I do not have further suggestions
(I'm still pretty new at this...).  But you should be able to find help
in the Ubuntu Forums.

-- 
Kernel hangs on boot (SATA, AMD64/i386)
https://bugs.launchpad.net/bugs/190492
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