Recently installed Ubuntu 18.04 after the automatic upgrade from 17.10 failed, resulting in my inability to turn on the system normally. After installing the OS the brightness controls on my laptop has stopped working. There are no brightness controls in the settings either in the new OS either. How can I get it to work?
Ubuntu – Brightness Buttons not working in 18.04
18.04brightnessshortcut-keys
Related Solutions
You can also use command line option to control brightness.
Steps:
- Open terminal using ctrl+alt+t.
- Type command "xrandr".
- It will display something like this:
4.You need to see (in the underlined part) which display is connected. (Here in my case it is LVDS1).
- Use following command to adjust brightness:
xrandr --output "your connected display name" --brightness "brightness value"
For example, in my case it'd be:
xrandr --output LVDS1 --brightness .75
Note: Brightness value should be less than 1. (Otherwise it will be too much brightness).
That's it. Hope this helps.
I also had this problem, but on different distributions the solution was different.
Solution provided by Anas Elazhar worked well until I switched to Xubuntu:
Open the file /etc/default/grub using gedit or any other text editor. Find below line.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"Change above line to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
If it doesn't work for you either try to change acpi_backlight value to video:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=video"
Also create the file /usr/share/X11/xorg.conf.d/80-backlight.conf but content is slightly different from the file that you created:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "acpi_video0"
BusID "PCI:0:2:0"
EndSection
If combination acpi_backlight=video with this file doesn't work change acpi_backlight back to vendor.
And do not forget to run sudo update-grub command in terminal every time you change /etc/default/grub!
Best Answer
If you are referring to the keys to change brightness up and down (in my laptop it is Fn+F11/F12):
I am running Xubuntu 18.04 and have struggled with the impossibility to control brightness using the Fn+F11/F12 keys since I installed it...
I just found out an option in the
Power Managementsection, "Handle display brightness keys", which by default came deactivated. I just turned it on and the Fn+F11/F12 keys work as expected.Perhaps there is a similar option in the Power Management section for Ubuntu vanilla and other flavors.