Brightness control missing after update

Asked by Nazarii Ritter on 2021-01-09

Ubuntu 20.04
Notebook HP 8570w
Brightness control is missing after recent update (7th or 8th of January 2021). Rebooting doesn't help.

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Solved by:
Nazarii Ritter
Solved:
2021-01-10
Last query:
2021-01-10
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2021-01-10
Bernard Stafford (bernard010) said : #1

https://askubuntu.com/questions/1230937/ubuntu-20-04-brightness-adjust-not-working
suggest start with 6 on above link.
sudo add-apt-repository ppa:apandada1/brightness-controller
sudo apt update
sudo apt install brightness-controller

This is a third party application (not convenient). But what happened to Ubuntu native brightness control?

BTW, brightness-controller doesn't work (Primary Brightness is disabled and grayed out).

Didn't help either.

Bernard Stafford (bernard010) said : #6

Look in Ubuntu Software - Top left search box - Type: DCC Control This is a Snap package for control of monitor [screen] parameters for contrast, brightness.

I guess I found the root of the problem: I've noticed that NVIDIA X Server Settings window was empty. Also, xrandr showed some error about gamma. Thus, I've tried to downgrade NVidia drivers (340) but got an error and the only option to reboot and was not able to log in again. Thus, I've reinstalled 390 version and the control came back.

Bernard, thank you for your attempts to help but I was looking for solutions to get the native brightness control back rather than using 3rd party applets.