[Bug 548537] [NEW] AMD64 alternate install fails to find CDROM on Thinkpad T400 in AHCI mode, only "Compatibility" mode works

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Attempted install of Lucid Lynx from the AMD64 "alternate" nightly build on March 25th.  
Platform is a Thinkpad T400 with a laptop SATA hard drive and CDRW/DVD.

ISOLINUX loaded, the installer began, I chose my language and keyboard, and then got "No common CD-ROM drive was detected".  
So the installation failed.

Additional information:

In the BIOS, my SATA mode is AHCI, which is what this computer came
with.

The BIOS correctly detects my hard drive, which is a Hitachi HTS722010K9SA00
After the menu driven install failed, I switched to a console and did a little exploring.
dmesg shows no SATA driver being loaded, and no hard drives or CDROM drives detected.
There are no sd or cd devices under /dev.

I then rebooted, and in the BIOS changed the SATA mode to "Compatibility". 
And then the installer worked, found the CDROM, configured the network, etc.

However before continuing, I rebooted, changed the SATA mode back to AHCI, and tried again.  
And it failed again.

Obviously this would be a fatal bug for most users, who would only say "Ubuntu didn't work" and go back to windows :-(  
Please fix before release!

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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AMD64 alternate install fails to find CDROM on Thinkpad T400 in AHCI mode, only "Compatibility" mode works
https://bugs.launchpad.net/bugs/548537
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