Owners of new Apple laptops with M1 processors said that they encountered a problem with the operation of the screen
The issue concerns the Fast User Switching option in macOS Big Sur. It allows you to change user accounts without having to log out.
According to posts on the MacRumors forums, AppleCommunity and Reddit, sometimes the screen saver on laptops with Apple Silicon appears without warning and makes the desktop workspace inaccessible.
When the splash screen appears on the screen, the pointerthe mouse is on top of it. It can be moved, but no actions can be performed. Users have to close and open the laptop lid or press the Touch ID key or use the Alt-Command-Q key combination.
Disabling Fast User Switching prevents the problem from occurring. The problem affects M1 devices - MacBook Air, 12-inch MacBook Pro and Mac mini.