Matthew Garrett wrote:
> The firmware programs the sata controller into piix mode, not ahci mode.
> On this specific hardware, the ahci driver is able to reprogram it -
> however, that isn't guaranteed in general, and attempts to do so have
> led to unfortunate behaviour like missing CD drives. Right now, the
> easiest thing to do would be to convince Apple to program the device
> into AHCI mode.

I doubt convincing Apple to release new firmware will be "easy," even if
it's the best solution.  I have no idea how to go about that.  Adding a
single line to ahci.c is definitely easy, though it may be a hack.

With a status of Wishlist, we'll have another Ubuntu release where this
problem will be left unsolved.  This is an old bug (actually a
regression--it used to work!) and I wish it could be solved in a way
that didn't require constant kernel patching on the behalf of all Mac
Pro users.

-- 
Shaw Terwilliger <`echo sterwill1io2nu | tr 12 @.`>

-- 
ata_piix used instead of AHCI for Mac Pro
https://bugs.launchpad.net/bugs/96692
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