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I have installed xubuntu 14.04 on an old sony vaio (vgn fs35gp model) and none of the FN + F keys are functioning (volume ,brightness etc). Xev doesnt give any outputs when Fn key is pressed. Similarly there are two special keys (S1,S2) on the laptop which doesn't give any outputs. Any advices are welcome.Thanks.

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In the terminal:

sudo leafpad /etc/default/grub

Change

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

Then, save the file.

sudo update-grub

Restart computer.

Or if you want GUI for those changes:

sudo add-apt-repository ppa:danielrichter2007/grub-customizer
sudo apt-get update
sudo apt-get install grub-customizer

Those changes did it for me, if it won't help you, we can examine further.

EDIT:

also try: acpi_listen in terminal...after that press some fn + XY combinations

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  • Thanks for your reply Michal. Unfortunately it didn't work again. acpi_listen also doesn't give any outputs. By the way I did a clean install of Xubuntu 15.04 to see if anything will change but still the same. Jun 16, 2015 at 17:27

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