More news: Putting <key>Kernel Flags</key> <string>agclog=10000 agcdebug=4294967295</string> in /Library/Preferences/SystemConfiguration/com.apple.Boot.plist enables debug output for the apple switching kext. This leads to a lot of information in dmesg.
The get/setMuxRegister calls seem to be inp/outps, the first argument is the port, second is 1/2/4 for b/w/l (size) and the third is the value. I tried using the outps in linux and was partially successfull: It's possible to power down the nvidia gpu using outpb 750 1; outpb 750 0. Power usage goes down considerably: Before: /proc/acpi/battery/BAT0$ cat state present: yes capacity state: ok charging state: discharging present rate: 28931 mW remaining capacity: 58150 mWh present voltage: 11775 mV After: /proc/acpi/battery/BAT0$ cat state present: yes capacity state: ok charging state: discharging present rate: 10382 mW remaining capacity: 57730 mWh present voltage: 11975 mV Unfortunately none of the ports seem to switch the display so it goes black when the card is powered down. I have no idea how to get the intel card to take over. Does anyone know more about switching using this method? Attached is a example dmesg, maybe someone sees where the mux is flipped.
kern.log
Description: Binary data
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