graphics switching notes for macbook pro 5.1

vgaswitcherooNotes.md

Requirements:

1. zcat /proc/config.gz | grep SWITCHEROO must return CONFIG_VGA_SWITCHEROO=y
2. Kernel modesetting must be on from boot
   To do this, add nouveau to the MODULES array in /etc/mkinitcpio.conf:
   MODULES="... nouveau ..."
   then regenerate the initial ramdisk:
   mkinitcpio -p linux

Now,
to see the state of the sswitch:
cat /sys/kernel/debug/vgaswitcheroo/switch

to switch to the 9600M GT GPU:
echo DIS > /sys/kernel/debug/vgaswitcheroo/switch

to switch to the 9400M GPU:
echo IGD > /sys/kernel/debug/vgaswitcheroo/switch