I was poking around with the Samsung Q45 and discovered a work-around by chance:
* press (amd release) the blue 'Fn' key *alone*
* depending on the focus that will open a menu somewhere on the desktop but do not worry and just ignore that for a moment
* now use the Fn-Up/Down key combinations to adjust the screen brightness as desired
* finally press the 'Esc' key twice
Outcome: screen brightness adjusted without a messed up keyboard :)
I was poking around with the Samsung Q45 and discovered a work-around by chance:
* press (amd release) the blue 'Fn' key *alone*
* depending on the focus that will open a menu somewhere on the desktop but do not worry and just ignore that for a moment
* now use the Fn-Up/Down key combinations to adjust the screen brightness as desired
* finally press the 'Esc' key twice
Outcome: screen brightness adjusted without a messed up keyboard :)