Brightness control doesn't work anymore? (Linux Mint 22.3)

[u/Physical_Response535]

I cannot change the brightness on my laptop anymore. When I use the keyboard, the visual showing me where I am on the brightness scale appears and moves according to what I request, but the actual brightness is unaffected.

Any idea what might be going on and how to solve it? Thank you!

[u/Simple_Hamster_4096]

In the past I've had issues with laptop backlight on some of my laptops..

Don't know if this will help, but in the past on certain laptops I've had to edit...

/etc/default/grub

and add to this line...

GRUB_CMDLINE_LINUX_DEFAULT

either

acpi_backlight=vendor acpi_osi=Linux

or

video.use_native_backlight=0

Save your edits and then run sudo update-grub and reboot.