Mouse cursor go off from game window, issue has been fixed adding "gamescope -w 2560 -h 1440 -W 2560 -H 1440 -f --force-grab-cursor --" in launch options command (-h and -w depends about your screen resolution what you have). After adding the gamescope, you must remember that the Steam overlay does not work.

Running the command in the terminal: "sudo sysctl -w kernel.split_lock_mitigate=0" solves the problem with a tearing fps.