I have successfully achieved dual boot from installation on the primary hard drive with the following configuration and issues:
Hardware; August 2012 build HP Envy DV7 laptop, Windows 8, i5 Ivy Bridge, UEFI/Secure Boot.
Linux: Ubuntu 12.10 x64 ISO.
In UEFI (F10 menu):
•Disable Secure Boot. I could not achieve boot in any configuration with it on.
•UEFI boot scheme (not Legacy BIOS). I tried Legacy mode, and can boot from disk, but not from an installation on the hard drive. UEFI flies right by it during boot every way I tried with it on.
•/Boot=EFI, /=EXT4, /Home=EXT4, SWAP=swap
With this configuration I can boot with user intervention during the boot sequence: 1) Select F9 Boot options in UEFI (BIOS) 2) Select the now avialble Ubuntu 12.10 option and procede.
3) Immediately the Ubuntu boot option screen is now available. Select prefered option and procede. 4) I'm in.
If anyone following this thread comes up with a way for the Windows UEFI boot loader to recognize the /Boot partition manually, please share. The above method is not that much of a pain, but an automatic boot whence windows recognizes Ubuntu as a boot option would be a somewhat more elegant affair. Also, I would prefer to have Windows handle the primary boot sequence, and not grub, as a personal preference, so I can live with the above until other options are available.