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
- 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:
bash screen.sh &