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Problem:

I can't adjust my brightness in ubuntu 18. The keyboard buttons, the slider, the terminal commands, none of them are working.

What I've tried:

  • installing an application, but it had no effect.
  • using xrandr commands like --brightness
  • editing grub file, like acpi=off, vendor, video, etc.
  • but, none of them worked out (;-;)

Can anyone help me out with this issue, thanks in advance.

Sample outputs:

~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected primary 1920x1080+0+0 0mm x 0mm
   1920x1080     77.00* 
~$ xrandr --output default --brightness 0.4
xrandr: Gamma size is 0.

Background:

I'm using MSI modern 14, ryzen 4500u variant, with AMD radeon graphics. I have no experience with ubuntu before, and I'm totally new to this OS.

The application suggested by @andrew.46 gives no error, but it doesn't change the brightness, the following is the output:

~$ sudo brightnessctl s 50%
Updated device 'input4::capslock':
Device 'input4::capslock' of class 'leds':
    Current brightness: 1 (100%)
    Max brightness: 1
Rahul Verma
  • 139

0 Answers0