Here are my issues :

  • I can't change the screen brightnesss on my laptop. The keyboard combinations made for it (Fn+F5, Fn+F6) do not work. I read that the desktop environment (Xfwm, or Xfce, I don't know the difference as both appear to be installed) should provide some addon buttons to set the screen brightness, but I could not find such options so far.
  • I cannot use the keys combination desined to turn on/off the light from my laptop keys (Fn+F3 and Fn+F4)

My pc : Asus GL553VD, i7-7700HQ, Nvidia 1050, with Windows 10 x64 preinstalled, and an UEFI bios.

I could only install my linux distro (Xubuntu 16.04) using the "nomodeset" option in the bios. ("acpi=off" did not allow Linux to start)

Previous attempts and possibly useful info :

  1. In the etc/default/grub file, I tried to replace "nomodeset" with "acpi_backlight=vendor", "acpi_backlight=native", "acpi_backlight=video". These prevented Linux to start so I switched back to nomodeset.
  2. I installed xblacklight but when I get the error "No outputs have backlight property" when typing e.g. "xblacklight =50"
  3. My folder sys/class/backlight also happens to empty though I don't really understand whether it is important.
  4. The sudo find /sys/ -type f -iname '*brightness*' command gave me several entries that are :

    /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/leds/phy0-led/max_brightness /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/leds/phy0-led/brightness /sys/devices/platform/i8042/serio0/input/input4/input4::capslock/max_brightness /sys/devices/platform/i8042/serio0/input/input4/input4::capslock/brightness /sys/devices/platform/i8042/serio0/input/input4/input4::numlock/max_brightness /sys/devices/platform/i8042/serio0/input/input4/input4::numlock/brightness /sys/devices/platform/i8042/serio0/input/input4/input4::scrolllock/max_brightness /sys/devices/platform/i8042/serio0/input/input4/input4::scrolllock/brightness /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ATK4002:00/leds/asus-wireless::airplane/max_brightness /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ATK4002:00/leds/asus-wireless::airplane/brightness /sys/module/video/parameters/brightness_switch_enabled /sys/module/i915/parameters/invert_brightness

The second file ('/sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/leds/phy0-led/brightness') only contains the value "1" but I did not manage to edit it.

  1. typing sudo xserver-xorg-input-all, I get the error :

     Depends: xserver-xorg-input-vmmouse but it is not installable.   
     E: Unable to correct problems, you have held broken packages."
  2. In the update manager settings, section "Additional drivers", I see two elements (that seem to correspond to my two video cards) :

    • "Nvidia corporation: unkown", for which I ticked to "Use Nvidia binary driver - version nvidia-384.111 from nvidia-384"

    • "Unknown: unknown", for which I ticked "Use microcode firmware processor for Intel CPUs from intel-microcode (free)".

    Yet I don't know which of the two video cards is being used, nor whether I should search towards the Nvidia gtx or towards the Intel video chipset to lower the screen brightness.

It has now been 5 days since I started attempting to get a clean Linux installation and my enthousiasm towards getting rid of buggy-costly-closed systems like Windows and Mac gets lower as my eyes are really burning.

Thanks for reading this. Any help/question is welcome.



First Install Brightness Controller with the following commands:

sudo add-apt-repository ppa:apandada1/brightness-controller
sudo apt update

For Version 1 with up to 4 Monitor Support:

sudo apt install brightness-controller-simple

brightness controller

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.