Debian Bullseyes: installing & configure brightness control on Xfce4

 

You need to install:

1. brightnessctl
2. grub-customizer
3. xfce4-power-manager   

# apt-get install brightnessctl grub-customizer xfce4-power-manager   

From Applications -> Settings -> Grub Customizer

1. Open General settings
2. At kernel parameters append acpi_backlight=video
   for example "quiet acpi_backlight=video"
3. Save and restart.

You can choose only one from these options:

• acpi_backlight=vendor
• acpi_backlight=video
• acpi_backlight=native
• acpi_backlight=none

You can change your brightness from Power Manager Plugin in Xfce4.

Note: after make any change, restart your Debian

Tested on

• Asus K45DR AMD A8 Series
• Debian 11.2
• linux-image 5.15.0-0.bpo.3-amd64