#!/bin/bash

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
}

echo _PS0 $(acpi_call "\_SB.PCI0.PEG0.PEGP._OFF")