force-integrated-graphics.sh for MacBook 17" 2010–2011 With Broken Radeon graphics chip

force-integrated-graphics.sh

#! /bin/sh

kextoffdir="/kextoff"
loginhookscript="/Library/LoginHook/LoadDelayedAMDRadeonX3000kext.sh"

echo "---------------------------------------------------------------
Run this script twice.
First, from a Recovery Mode commandline to run csrutil disable.
Second, after rebooting to a Single user mode commandline, with / partition mounted writeable, to do all the things that must be done with csrutil status= disabled

After that, rerun Recovery mode to run \`csrutil enable\` again.

* How to start in Recovery mode? Cmd-R

* How to start in Single user mode? Cmd-S

---------------------------------------------------------------
"

echo "
nb: csrutil disable only works in recovery mode
"
csrutil disable
echo "
csrstatus:
"
csrutil status

echo "
Moving the AMDRadeonX3000.kext out of extensions and updating the extensions cache
"
mount -uw /
mkdir -p $kextoffdir
mv /System/Library/Extensions/AMDRadeonX3000.kext/ $kextoffdir/
touch /System/Library/Extensions/


echo "
Set nvram magic things. This is the step that disables the Radeon as the bootup graphics card
"
nvram 'fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00'
nvram boot-args="-v"
nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs
nvram -p

echo "
Add a loginHook to load AMDRadeonX3000.kext after boot
"
mkdir -p /Library/LoginHook

cat > /Library/LoginHook/LoadDelayedAMDRadeonX3000kext.sh <<EOF 
#!/bin/bash
if [ -f /System/Library/Extensions/AMDRadeonX3000.kext ] ; then
	syslog -s -l error "The AMDRadeonX3000.kext is back in /Library/Extensions. You may need to re-run $0 to postpone loading this kext until login"
fi

kextload  $kextoffdir/AMDRadeonX3000.kext
pmset -a force gpuswitch 0 # undocumented/experimental
exit 0
EOF
chmod a+x $loginhookscript
defaults write com.apple.loginwindow LoginHook $loginhookscript
nvram boot-args="-v agc=0"

echo "
Done.

Use the reboot command to reboot.
"