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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
  • @andrew.46 - I already have this (brightness-controller app) and redshift, it's GUI sliders have no effect on brightness. And the redshift too gave the same disappointment. – Rahul Verma Feb 28 '21 at 06:21
  • Yes I eventually saw that and deleted my comment too slowly :). Have you experimented with xbacklight? I am not sure that this will work with your hardware though, specifically the AMD Radeon graphics... – andrew.46 Feb 28 '21 at 06:23
  • If this is a no go I believe there is another application brightnessctl that might be worth looking at: https://www.mankier.com/1/brightnessctl – andrew.46 Feb 28 '21 at 06:32
  • Ubuntu has both releases that use yy format (snap only, longer supported lives with everything running containerized) and the stadnard yy.mm releases that use deb packages... You use both in your question (they refer to different products) so please clarify. Also I did testing on brightness/backlight/etc over ~20 devices and they differ from the same commands, depending on graphics cards in use (plus internal/external displays..), but I'd suggest redshift & manual edit of .conf file – guiverc Feb 28 '21 at 06:33
  • @andrew.46 - I used brightnessctl and it works without errors, but it didn't had any effect, sadly. It changed current brightness, but not max brightness. Hence, the brightness is still constant :\ – Rahul Verma Feb 28 '21 at 06:41

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