Fixing Zorin OS brightness issues

This is more of a note to myself.

After upgrading my Kernel to 6.8.0-57-generic, the screen brightness control stopped working and external monitors no longer functioned.

I’m using an AMD Radeon 5000 Series microchip on an HP Pavilion machine.

The fix involved changing the GRUB_CMDLINE_LINUX_DEFAULT value in the grub file:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=native"

Changing acpi_backlight to “vendor” activated the night light mode again, but I still couldn’t adjust the brightness.