#!/bin/bash

modprobe acpi_call

if ! lsmod | grep -q acpi_call; then
    echo "Error: acpi_call module not loaded"
    exit 1
fi

acpi_call () {
    echo "$*" > /proc/acpi/call
    cat /proc/acpi/call
}

PSC=$(acpi_call "\_SB.PCI0.P0P4.GFX0._PSC")
case "$PSC" in
    Error*)
        echo "Error: could not read card state ($PSC)"
        exit 2
        ;;

    0x0)
        echo "nVidia card already enabled"
        ;;

    *)
        PS0=$(acpi_call "\_SB.PCI0.P0P4.GFX0._PS0")
        case "$PS0" in
            Error*)
                echo "Error enabling card ($PS0)"
                exit 3
                ;;
        esac

        PSC=$(acpi_call "\_SB.PCI0.P0P4.GFX0._PSC")
        case "$PSC" in
            Error*)
                echo "Error: could not read card state ($PSC)"
                exit 4
                ;;
            "0x0")
                echo "Enabled nVidia card"
                ;;
            *)
                echo "Enabling nVidia card failed (_PSC returned $PSC)"
                exit 5
                ;;
        esac
        ;;
esac

if ! lsmod | grep -q nvidia-current; then
    modprobe nvidia-current
fi