#!/bin/bash
# This script should contain the command(s) nessesary to switch off the
# nVidia card. It works on Asus 1015PN
# Please note that the acpi_call module is need for these operations:
#
# http://linux-hybrid-graphics.blogspot.com/2010/07/using-acpicall-module-to-switch-onoff.html
# https://github.com/MrMEEE/bumblebee/issues/171

if ! lsmod | grep -q nvidia; then
    echo "Skipping: nVidia Card already disabled"
    exit
fi

rmmod nvidia
if lsmod | grep -q nvidia; then
 echo "Error: could not unload nvidia module, leaving card turned on"
 exit
fi
modprobe acpi_call

if ! lsmod | grep -q acpi_call; then
    echo "Error: acpi_call module not loaded"
    exit
fi

acpi_call () {
    echo "$*" > /proc/acpi/call
    result=$(cat /proc/acpi/call)
    case "$result" in
     Error*)
      echo "Disabling nVidia Card failed ($result)."
      ;;
     *)
      echo "Disabling nVidia Card Succeded."                                                                                
     ;;
    esac
}

# disables the card
echo $(acpi_call "\_SB.PCI0.P0P4.DGPU.DOFF")

# If I understood as well, this ACPI call just tells to hardware 
# to enable both graphics cards at boot (and not just nvidia one)
echo _PS0 $(acpi_call "\OSGS 0x03")