ammgws/FMVS54GR_ubuntu_brightness_hotkeys_fix.md

Last active September 4, 2017 15:07

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Fujitsu Lifebook FMVS54GR - fix brightness function keys not working in Ubuntu 17.04

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FMVS54GR_ubuntu_brightness_hotkeys_fix.md

Problem

Brightness function keys (Fn+F5,F6) do not work (however others such as volume do work)
Tried xbacklight but it did not work.
No response whatsoever when checking with acpi_listen, xev, evtest.
However able to change brighness in Ubuntu "Brightness and Lock" control panel applet.

Workaround

sudoedit /etc/default/grub and add acpi_osi= to GRUB_CMDLINE_LINUX entry.
sudo grub-mkconfig -o /boot/grub/grub.cfg

Why?

Couple of links to read about ACPI and kernel boot params:
http://redsymbol.net/linux-kernel-boot-parameters/
https://unix.stackexchange.com/a/268106

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