Stuck on Lock Screen when Full Screen Game is Running

Distribution

Linux Mint 22

Package version

Cinnamon 6.2.9

Graphics hardware in use

NVIDIA GeForce RTX 3080

Frequency

Always

Bug description

If I'm running a video game in full screen and Linux Mint auto-locks, I cannot type my password. My computer becomes stuck on the lock screen. My mouse also seems to become trapped; if I do manage to get my mouse "free" so it's visible, it can't click anything. The only way I've found to get out of this is to hard reboot my PC via holding down the power button (my case doesn't have a soft reboot button, unfortunately).

Steps to reproduce

1.) Run a video game through Steam in full screen mode.
2.) Wait for Linux Mint to auto-lock the screen.
3.) Try typing in your password or clicking something with your mouse, it shouldn't be possible.

Expected behavior

I am able to enter my password and get back into my computer. This issue did not occur on Linux Mint 21.3 Virginia, I was always able to log in after the screen locked.

Additional information

In case it's relevant, I did upgrade directly from Linux Mint 21.3 to 22 using the upgrade tool. I'm not sure if this bug will occur on a fresh install of Linux Mint 22.

Reproduce the lock-screen failure on Linux Mint 22 with Cinnamon 6.2.9, an NVIDIA GeForce RTX 3080, and a full-screen Steam game, then compare the behavior with Linux Mint 21.3. Confirm that the password and mouse work after auto-locking while the game is full screen, without requiring a hard reboot.