ZorinOS stays in black screen after going to suspend

Some Stuff, You can check:

  • Are Secure Boot and Fast Boot in BIOS disabled?
  • If Windows is installed: Is Fast Start-Up in Windows disabled?
  • Because You have Nvidia and Intel Graphics: Does Your System run in Wayland or X11? You can check that in Settings>About.
  • Maybe this can help: Poweroff after login when lid is closed - #5 by StarTreker