The brightness key (fn + arrow(left or right)) on my acer laptop ASPIRE v15 are not working.
I can control the brightness by changing the value of brightness by editing the file:

I want to connect the (fn + arrow) key to a script which edits the value in the
above file. But acpi_listen does not detect the pressing of (fn + arrow(left or right)) key. Though, it is able to detect (fn + arrow(up or down)) keys for volume control.
How to get these keys detected for brightness control by the acpi?
Edit1: I am using Ubuntu 16.04 LTS
Edit2: Binding another keys(other than the (fn + L/r) and calling the script as non-acpi event forces me to run the script by placing it inside /etc/sudoers.d/ directory in order to avoid prompting for password at each press of the key. (as changing the value of brightness requries root permission).

  • 1
    Welcome to Ask Ubuntu. You haven't told us your release of Ubuntu, or your desktop (which may be the default, but without release we cannot know). – guiverc Feb 3 at 13:20
  • I am using Ubuntu 16.04 LTS . – user2734113 Feb 3 at 13:59

In settings > Devices > Keyboards look for the hotkeys for controlling brightness. If your built in keys don't work, you can manually bind over them (Select the adjust brightness shortcut and press Fn + L/R)

  • I am unable to bind fn + l/r key through this method. – user2734113 Feb 3 at 18:25
  • It seems that acer doesnot support fully featured acpi for GNU/Linux. I am just going with running the script and linking to other keyboard short cuts. – user2734113 Feb 19 at 2:27

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