18Jun
Guide: Generate DSDT from Ubuntu Live CD
1. Download Ubuntu Live CD from the ubuntu web site
2. Burn and boot from CD. You'll be in Ubuntu on the desktop. Default user is "ubuntu" and home folder is /home/ubuntu.
3. From top menu bar, accessories (system) launch terminal and type:codesudo cat /proc/acpi/dsdt > dsdt.aml
4. Now you'll have it in your home folder.
5. You can save it to a USB flash drive and transfer to OS X for future editing.
Done!
Note: When I did this, I could not write to my USB thumbdrive for some reason, so I used DropBox to solve the problem. You could also scp it to a server or another computer.