Ubuntu 20.04 bugfixes - lmmx/devnotes GitHub Wiki

gdm [gnome display manager] auto-suspends [power saving regulation introduced] after 20 minutes
- Apparently there’s an issue with NVIDIA drivers using gdm
- Replace gdm with lightdm
- See guidance here to fix: https://forum.khadas.com/t/ubuntu-20-04-disable-sleep/8858/9