Laptop screen not bright enough

Asked by Svante Jacobsen on 2020-06-25

Dual boot HP Elitebook x360. Grub menu is bright and nice.
Booting Windows, screen brightness is ok and I can sit outside on a sunny day doing my work (to the extent you can do that running Windows).
Booting Ubuntu, screen quickly dims (even login screen) and the entire working day is hard on mind and eyes. Even in a room with blinds completely down it's bad.

Using the buttons for brightness to set the maximum brightness does not work - it's still too dim.

I have tried with xrandr:
$ xrandr --output eDP-1 --brightness 0.5
$ xrandr --output eDP-1 --brightness 1

but 1 setting is just not bright enough.

Please, anyone, what do I do?

$ lsb_release -rd
Description: Ubuntu 20.04 LTS
Release: 20.04

It's an HP Elitebook x360 1040 G6 Notebook PC. HP support says it has a screen function to block people from seeing the screen from the sides. Sure View? In Windows and Ubuntu, Sure View is toggled through Fn-F2, but only for Windows is the brightness adjustable in both modes (Ubuntu only when Sure View is off - which is ok I guess if it didn't stop at abt. 60%).

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With Sure View tuned on: The display brightness can be controlled with the keyboard hotkeys, but not through software

Great! My problem was that Sure View WAS on when hotkeys worked but off (and dark when hotkeys didn't work). No way to see if it is on or off but manipulating brightness through command line worked like a charm just switching Sure View off:

$ xrandr --output eDP-1 --brightness 1

So happy to be back on Linux. Now, let's get that LTE modem working...

Thanks actionparsnip, that solved my question.