On a Lenovo Legion 7 laptop with Ubuntu 20.04:
When I close the lid, laptop shuts all lights down and gets quiet. When lid is re-opened, the keyboard lights turn on, and also the fan, but not the display.
Pressing Ctrl+Alt+F1(2,3,4,5,6,7,8,9,10,11,12) has no effect. Also after re-opening lid I can NOT connect from other pc to it via SSH (which works otherwise), so it is obviously NOT purely video problem, instead the system is not recovering at all. The only signs of life are the keyboard lights and the fan. The drive encryption is set up in BIOS. Same effect (non-recovery) happens if I suspend the laptop from UI.