post_install() {
  dkms_install $1
}

pre_upgrade() {
  dkms_remove $2
}

post_upgrade() {
  dkms_install $1
}

pre_remove() {
  dkms_remove $1
}

post_remove() {
  echo "Updating module dependencies. Please wait ..."
  depmod $(uname -r)
  echo ""
}

dkms_remove() {

  if [ -n "$(dkms status -m nvidia-bl -v ${1%%-*})" ]; then
    dkms remove -m nvidia-bl -v ${1%%-*} --all || return 1
  fi
}

dkms_install() {
  dkms install -m nvidia-bl -v ${1%%-*} || return 1

  sudo modprobe -r nvidia_bl
  sudo modprobe nvidia_bl
  
  echo ""
  echo "If your backlight is very dim, please check /etc/modprobe.d/nvidia_bl.conf"
  echo ""
}