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.
** Changed in: linux-source-2.6.20 (Ubuntu)
Importance: Undecided => Wishlist
Status: Incomplete => Confirmed
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ata_piix used instead of AHCI for Mac Pro
https://bugs.launchpad.net/bugs/96692
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