Hi all, Auto suspend and auto screen blank will work the 1st time after a reboot, but then stop working. Manual suspend works fine.
I guess my nvidia card (RTX 3060) is a suspect, but I'm on the latest driver.
Any suggestions on how to debug what's going on?
Switching to another driver might help, at least to identify whether this is a driver issue or not:
Cheers Zenzen, I will definitely try that at some point, but my previous experience with swapping between drivers hasn't been great, and I want to finish my current game first 
You should try to narrow the problem down by tweaking some of the power and screen settings. For example, you can prevent the system from going into sleep mode while still allowing the screen to go blank. If that works normally, at least that will tell you where the problem is more specifically.
For example:
Settings -> Privacy -> Screen.
Settings -> Power.
Older Nvidia drivers has alot of issues with suspend. Latest driver ? You installed it manually ? If yes suspend issues should be gone with the 565 releases.
Because You are using an Nvidia Card: Does Your System run in Wayland or Xorg? To check that, go the Settings>About and look there for a Line that should be called ''Window Manager'' or similar and check if there stands ''Wayland'' or ''X11''.
If there should stand Wayland, try it with switching to Xorg. To do that go to the Login Screen. There click on Your Profile so that the Password Field appears. When it is appeared, You shoud see in the bottom right Corner a Gear Icon. Click on it and choose the Option ''Zorin Desktop on Xorg''.