Laptop Brightness Buttons
under Linux
Serge Y. Stroobandt
Copyright 2015–2016, licensed under Creative Commons BY-NC-SA
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- Brightness Buttons
Problem
Laptop brightness buttons may not function out of the box under Linux.
Solution
Here is how to get these special keys working. In a terminal window type:
Using the arrow keys, navigate to the following line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
At the end of the line add acpi_osi=
to get:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="
Write the file out by hiiting [Ctrl]+[O]
, followed by [Enter]
. Exit nano
with [Ctrl]+[X]
.
Finally, do not forget to update grub
using the following command:
Now the laptop can be rebooted and the brightness keys should be working.
5
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Last update: Wednesday, September 1, 2021.