sharing a script to Setup as a Second Screen on Linux with X11 (and slightly changed from docs)

[pedro-nonfree]

so, in my case, did not work https://github.com/matteodelabre/vnsee/blob/master/docs/second-screen/linux-x11.md

I have intel [1] but I need the modesetting Driver

Hence, I was testing with another monitor I am using as shown in Generic Workaround, but I needed some changes to make it work

So here it goes the script I used, I hope is useful, maybe the docs should be reviewed, next person that find this maybe would like to help on that. I already spend so much hours reaching to this.

# thanks https://gist.github.com/LottieVixen/166fae536ceb2214f795670c8c4c8ee2
TARGET_DEVICE="HDMI-2"
REF_DEVICE="HDMI-1"
MODELINE="$(gtf 1404 1872 60  | grep Modeline | cut -f4- -d' ')"
# returns "1408x1872_60.00"  225.00  1408 1520 1672 1936  1872 1873 1876 1937  -HSync +Vsync
MODELINE_NAME="$(echo $MODELINE | cut -f2 -d'"')"
# returns 1408x1872_60.00
eval xrandr --newmode ${MODELINE}
xrandr --addmode "${TARGET_DEVICE}" ${MODELINE_NAME}
xrandr --output "${TARGET_DEVICE}" --mode ${MODELINE_NAME} --left-of "${REF_DEVICE}"
# turn off screen:
# xrandr --output "${TARGET_DEVICE}" --off

[1] via lspci command: 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)