The brightness keys on my laptop work ok, and gnome shell displays a level bar when changing it.
But the level bar doesn't display any values (absolute nor relative).
How can I retrieve the current brightness value?
Say - e.g. for scripting purposes - to be able to restore it later, in a reliable fashion.
Use case: for example, you created a color profile at a certain brightness level - and after temporarily changing it around you want to go back to this well-defined fixed point.