this is the output of grep PCI /var/log/Xorg.0.log when booting with
grub-efi

Grub commandline:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.modeset=1 i915.lvds_use_ssc=0 
i915.lvds_channel_mode=2"

/boot/grub/custom.cfg:
## Switch gmux to IGD
outb 0x728 1
outb 0x710 2
outb 0x740 2
## Power down ATI
outb 0x750 0


** Attachment added: "intel_grub_efi.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1178747/+attachment/3672504/+files/intel_grub_efi.txt

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https://bugs.launchpad.net/bugs/1178747

Title:
  vgaswitcheroo on the Macbook Pro 8,2 high-res

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