Just set this on my MiniPC running Debian which runs Jellyfin.

    sudo nano /etc/default/grub

Look for GRUB_CMDLINE_LINUX_DEFAULT and add: i915.mitigations=off

    GRUB_CMDLINE_LINUX_DEFAULT="quiet i915.mitigations=off"

Then:

    sudo update-grub
    sudo reboot

To verify:

    cat /proc/cmdline