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Whenever I log in to Ubuntu, the brightness automatically goes to full. I'm using ubuntu 20.04 LTS with dual boot.

Any solution for this?

dipansh
  • 101
  • https://askubuntu.com/questions/1312008/screen-brighness-always-come-back-to-1/1312197#1312197 and if light is not remember (I have only just now installed it) you can set a startup script for login like light 50 , note from light --help -O option to save it – pierrely Jan 31 '21 at 04:49
  • yep it did not save for me, so requires a script to be run at startup. – pierrely Feb 01 '21 at 21:58

1 Answers1

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This can often be fixed by adding a setting to your Grub configuration. Try this:

  1. Open Terminal (if it is not already open)

  2. Edit the Grub configuration file:

    $ sudo vi /etc/default/grub

    Note: Feel free to use any text editor you prefer, so long as you are editing the file with sudo.

  3. Find the line that starts GRUB_CMDLINE_LINUX_DEFAULT and add acpi_backlight=vendor. This should give you a line that looks similar to this:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

    Note: Your line may be longer with additional settings if you have an Nvidia video device or other hardware.

  4. Save the file and update Grub:

    $ sudo update-grub

  5. Reboot.

This should resolve the issue.