Okay, after more tinkering, I finally got Ubuntu 12.04 booted in EFI mode. Here are the steps I did:
- when you get to the grub menu, hit "e" over regular 12.04 boot
- add "outb 0x750 0" to the second line. your menu entry should look like this:
Code:
menuentry 'Ubuntu, with Linux 3.0.0-12-generic' --class ubuntu --class gnu-linux --class gnu --class os {
outb 0x750 0
recordfail
set gfxpayload=$linux_gfx_mode
insmod gzio
insmod part_gpt
insmod ext2
set root='(hd0,gpt5)'
search --no-floppy --fs-uuid --set=root bc495raf-515r-4r2b-b3de-0ec679a7303a
linux /boot/vmlinuz-3.0.0-12-generic root=UUID=bc495raf-515r-4r2b- b3de-0ec679a7303a ro hpet=force
initrd /boot/initrd.img-3.0.0-12-generic
}
That let me boot into Ubuntu. The 9600 is disabled and the 9400 is the only GPU activated.
I don't really know how to make this change permanent though.
The link I got the answer from is here:
http://askubuntu.com/questions/73332...ro-5-1-5-2-5-3
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