Screen tearing when playing local files

This is an interesting observation. You can try testing it...

sudo nano /etc/default/grub

Arrow key down to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Add the parameter i915.modeset=1 to make it:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.modeset=1"
ctrl+x to exit, then the y key to say yes to save, then the enter key.
The terminal will revert to normal. Run

sudo update-grub

Now, run

sudo apt update && sudo apt upgrade

Reboot and test...