Public bug reported:

Binary package hint: linux-source-2.6.20

This only applies to kernel version 2.6.20-12 and later as far as I can
tell.

Description:
This testing was done on a Mac Pro in a Parallels Desktop (build 3188) for Mac 
virtual machine set to OS Type: Linux and OS Version: Other Linux kernel 2.6.  
The issue also happens with OS Version set to Debian.  This install was done as 
Ubuntu Feisty Herd 5 since I am not able to boot Feisty Beta due to the optical 
drive recognition issue I am describing.
When booting the virtual machine from the live cd or a full installation of 
Ubuntu Feisty Fawn (herd 5 in this case) with the Parallels CD/DVD-ROM set to 
be the Mac Pro's physical optical drive and set to Connect at startup, the 
optical drive does not get recognized properly by kernel version 
2.6.20-12-generic.

Kernel versions 2.6.20-11-generic and 2.6.20-9-generic have been
confirmed to work and read the inserted CD properly in the same virtual
machine.  When I say that the optical drive does not get recognized, I
mean that if you open the Computer in Nautilus and double click on CD-
ROM 1, the error "Unable to mount the selected volume.  mount: special
device /dev/hdb does not exist."  In earlier kernel versions, the CD
drive shows up in the Computer list as CD-RW/DVD+RW and shows up on the
desktop after logging in.

The optical drive installed in my Mac Pro as reported by Apple is: SONY
DVD RW DW-D150A.  In Ubuntu, if I right click on the drive in the
Computer list, click Properties, and go to the Drive tab, the Model
listed is: PRL CD-ROM [1] and Firmware: FMR10003.  I assume PRL there
stands for Parallels since they virtualize most hardware components in
that way.

I would blame Parallels for this problem, but I have to claim this is a
kernel bug since earlier kernel versions worked flawlessly.  Also, note
that this issue exists in Fedora 7 as well.  Kernel version
2.6.20-1.2933.fc6 in Fedora Core 6 works with the drive just fine.  All
kernel versions in Fedora 7 test 2 that I have tried (2.6.20-1.2949.fc7,
2.6.20-1.3003.fc7, and 2.6.20-1.3017.fc7) have basically the exact
problem I described above.

Also note that both the desktop and alternate versions of the Ubuntu
Feisty Beta install CD fail to boot on this virtual machine due to the
optical drive problem.  After hitting enter to begin booting the live
CD, some text scrolls and then the usual "ACPI: Unable to locate RSDP"
displays followed by "Loading, please wait..."  The screen then goes
blank to start loading the graphical progress, but remains blank.  If
you switch the terminal to tty1 by pressing ctrl+alt+F1, you see that
"ata2: rest failed, giving up" displayed.  After that are a bunch of
ata1.01 errors.  I am attaching some screenshots to this report to
illustrate this.

** Affects: linux-source-2.6.20 (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
Parallels Desktop for Mac Optical Drive not recognized
https://launchpad.net/bugs/95830

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