I have tried many of the proposed solutions that I could find on the web, but any of them worked for me. I detail here my problem and some of the things that I tried:
Lubuntu 16.04 and
When trying to adjust the brightness of the laptop, the brightness indicator appears in the upper right corner reflecting the changes, but no variation occurs on the actual display brightness.
What I have tried:
Use the default keyboard keys to adjust the brightness.
xbacklightpackage and change the brightness with
$ xbacklight -inc 10and
$ xbacklight -dec 10
Manually edit the file
In the last two, if I later use the default keyboard keys to adjust the brightness, I can see how the changes were applied, but again no variation occurs on the actual display brightness.
I would really appreciate your help! Any suggestion?