Possible solutions for laptop brightness control issues

Support
,
1

Hello,

  • OpenMandriva Lx version:

All

  • Desktop environment (KDE, LXQT…):

All

  • Description of the issue (screenshots if relevant):

Users find laptop/notebook brightness control not working as expected

  • Relevant informations (hardware involved, software version, logs or output…):

This is a commonly reported problem for many Linux distributions including OpenMandriva. Hardware manufacturers have created to many different ways to control laptop/notebook brightness controls so there is no one configuration that works for all.

Currently we know of 3 things a user with this issue could try to resolve this issue. These all involve changing something on the GRUB_CMDLINE_LINUX_DEFAULT line in the file /etc/default/grub.

First save an example of the original file so you can go back to that if you need to.

sudo cp /etc/default/grub /etc/default/grub.bak

  1. Change
    acpi_backlight=vendor
    to
    acpi_backlight=native

then save the file and run
sudo update-grub2
and reboot.
This one is perhaps the most common “fix” for users with this issue.

  1. Change
    acpi_backlight=vendor
    to
    acpi_backlight=video

then save the file and run
sudo update-grub2
and reboot.

  1. Remove this
    acpi_osi=Linux acpi_osi='!Windows 2012' acpi_backlight=vendor

then save the file and run
sudo update-grub2
and reboot.

There is also an experimental package available for testing for Cooker users to try for this.

  1. dnf in udev-backlight
    Then reboot
2

udev-backlight package available for testing in Rock and Rolling branches now.

For Rock x86_64:

sudo dnf in udev-backlight --enablerepo rock-testing-x86_64

For Rolling x86_64:

sudo dnf in udev-backlight --enablerepo rolling-testing-x86_64

znver 1 users simply change x86_64 in the command to znver1.