Work-a-round for black screen after sleep on Lenovo Lengion running linux with hybrid graphics

recover-from-sleep.sh

#!/bin/bash

# After the lenovo legion laptop with Nvidia discrete graphics is woken up from sleep mode, 
# and the screen where X is running is black, go to a text terminal (CTRL+ALT+F1).
# Log in, then run this script. 
# While it is running, go back to the screen X is running on, typically CTRL+ALT+F7.
# After a moment or two, your X-session should come back.
#
# PS: I found ths somewhere on the web, I don't remember where. It has helped me at least.
#
# Xubuntu Jammy, LTS, Nvidia driver 525.125.06, AMD Ryzen, running in Hybrid graphics mode.
# 
# I have zero idea if this is usefull to any other system configuration.

while true; do DISPLAY=:0 xrandr --auto && break || sleep 1s; done

If the script worked, remember to go back to your text terminal and log out. Probably not good to leave a logged in account running ...