Fix Linux' Auto Brightness Adjustment

May 8, 2022

prevent Linux from changing the screen brightness of your laptop when you plug it in.

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The Problem With Linux Screen Brightness Adjustment

I use Ubuntu, and on my Acer Nitro 5, whenever I plug the laptop to power the brightness gets lowered to 10%. This is wrong since I want the brightness not to be lowered when the laptop is charging. It looks like a bug related to the Linux drivers that many users have.

The Solution

In a nutshell, the solution is to enable the vendor drivers instead of the ones that come with Linux, or so I understood from this post. Here is what I had to do:

• edited the grub file which is at /etc/default/grub by adding acpi_backlight=vendor to the end of GRUB_CMDLINE_LINUX_DEFAULT="quiet splash", so the result looks like this:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
  

• I ran update-grub command in the terminal and restarted the machine.