after installing ubuntu-server, HDD's are not detected in AHCI mode

[scar]

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scar @ 05/15/2010 08:18 PM:
> i have two identical servers with identical hardware.  the servers are
> sun fire x2250's with two 1 TB hard disks.  on server #1, i installed
> ubuntu-server a couple weekends ago.  in the BIOS i configured the disks
> to use AHCI mode.  everything works great.  i created two RAID-1 md
> devices.  on md0 i formatted ext4 and put /boot.  on md1 i put LVM with
> logical volumes for / and swap.
> 
> then, last weekend, i did the same thing (AFAIK) for server #2.  only
> this time, after rebooting, the hard disks are no longer detected; the
> BIOS just hangs at "auto-detecting SATA PORT 0".  if i change, in the
> BIOS, the disks back to IDE mode instead of AHCI, they get detected.
> isn't that strange?

wonder if it's related to bug #551965[1][2]?

1.
https://wiki.ubuntu.com/LucidLynx/ReleaseNotes#Partition%20alignment%20changes%20may%20break%20some%20systems
2. https://bugs.launchpad.net/ubuntu/+source/partman-base/+bug/551965

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