Disable ghosts video outputs on Linux

disable-video-output.sh

#!/bin/bash -e
#
# How to run this script:
# $ (source <(curl https://gist.githubusercontent.com/frafra/babfe4c32478923687ea/raw))

DIR=/sys/class/drm
REGEX="(card[0-9]+-(.+))"
OUTPUTS=($(for f in $DIR/*
do [[ $f =~ $REGEX ]] && echo ${BASH_REMATCH[1]} || true
done))
echo "Video outputs:"
i=1
for output in ${OUTPUTS[@]}
do
    echo "$i) $output " $(cat $DIR/$output/{status,enabled})
    let i++
done | column -t
read -p "Select video output [1-${#OUTPUTS[@]}]: " id
[[ $id -ge 1 && $id -le ${#OUTPUTS[@]} ]] || exit 1
let id--
[[ ${OUTPUTS[$id]} =~ $REGEX ]] || exit 1
pkexec sed -ri 's/(GRUB_CMDLINE_LINUX=)"(.*)"/\1"\2 video='${BASH_REMATCH[2]}':d"/' /etc/sysconfig/grub
for f in /boot/{grub2,efi/EFI/fedora}/grub.cfg
do [ -f $f ] && pkexec grub2-mkconfig -o $f
done