14.04 Asus g56jr Fn + Brightness control

Question

I have recently installed Ubuntu on my new Asus G56Jr laptop. I noticed that despite all the other Fn+fX keys are working, the screen brightness does not.

I have already tried editing the grub, as many here earlier advised, with no result. Also I tried using various drivers. ATM I am using the NVidia binary driver 331.38 and my grub file looks like this:

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

I know this has been already asked plenty of times, but I couldn' t find any working solution.

edit

Unlike many others I can actually set the brightess in Settings.

Solution 1

I have an ASUS G56JK and had the same problem. It is now fixed for me.

In the terminal:

sudo gedit /etc/default/grub

Change

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

Save, then

sudo update-grub

Restart computer.

The function keys (fn+F5/F6) should now be active.

Solution 2

The most generic option is to control brightness through the /sys class file as below echo 150 > /sys/class/backlight/intel_backlight/brightness. The highest value of this file is 946.

In addition, you can create a file /usr/share/X11/xorg.conf.d/20-intel-conf and put the below value:

Section "Device"
Identifier  "card0"
Driver      "intel"
Option      "Backlight"  "intel_backlight"
BusID       "PCI:0:2:0"
EndSection

Not sure if the below step is required, but i had used it prior to the above step, Edit /etc/default/grub and put the GRUB_CMDLINE_LINUX_DEFAULT as

 
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force"
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX=""

Then I did a sudo update-grub

You could also use the utility xbacklight and set-up keyboard shortcuts in unity/ Compiz to call it. Setting shortcut:
xbacklight -dec 5 to decrease by 5 units
xbacklight -inc 5 to increase.

While, the xbacklight will not solve "fn" keys, but it would give you a simple keyboard shortcut nonetheless.

Solution 3

On my ASUS GL552vw with ubuntu 16.04:

Just working by adding acpi_backlight=native in /etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_osi= acpi_backlight=native"

EDIT 1

Don't forgett to update grub !

sudo update-grub

Comments

[bleeves]

Adding: Option "RegistryDwords" "EnableBrightnessControl=1" to "device" also works on some hardware. You may need to also add the line "VendorName" "nvidia"

[Dr. Nefario]

Unfortunately the given solutions do not work for me. Yes, the /sys class file control works, but this is cumbersome solution and it won't be comfortable to set brightness throughout the entire day.

[Hrachos]

Unfortunately not for me :/ I have nVidia GTX760M and Intel core i7 4700HQ

[Dr. Nefario]

I am with the same hardware like you. Sorry to hear it doesn't work for you...

[Yannick Serra]

Not sure why you were downvoted. This was the first thing to work for me. Thanks!

[Captain_Frog]

I found out that this is to be done again after any upgrading to new versions

[Samy Dindane]

Works on an Asus F200MA, thanks a lot! I've seen some tutorials using acpi_backlight=vendor or pcie_aspm instead of acpi_osi, but neither worked for me. I guess it's just a matter of minor hardware differences?! Anyway, I'm glad it works!

[abhishek-23]

You might have gotten downvoted because you're suggesting edit of default files. You should actually add menuentry to /etc/grub.d/40_custom. Menuentry can be copied from /boot/grub/grub.cfg find one that is called the same as the ubuntu you menu item you usually boot in grub. After copied to 40_custom find line that has "quiet splash" and add acpi_osi= to the end. Google for "Maintenance-Free Menuentries" to find out how to make it update proof. And rename 40_custom to 06_custom so that it will be the first option. Run sudo update-grub.

[akonsu]

worked on ASUS R554L

[opu 웃]

Worked on ASUS X550L. Thanks

[Daniel Zippert]

Worked perfect on asus R555JK, Ubuntu 16.04. Thanks!