External screen might not work out of the box with Lenovo Ideapad 1 laptops.

The following steps were performed on PostX Gnu/Linux (based on Debian 11) to remedy the situation.

• Remove nomodest entry from grub config file:

sudo nano /etc/default/grub
sudo update-grub

• Reboot the system.
• Install arandr to identify & setup the (external) display:

sudo apt install -y arandr

• Save configuration to an sh file(screen.sh here) and make it autostart. Openbox as an example:

nano .config/openbox/autostart

bash screen.sh &
exec openbox