Question about HP ProBook 450 G5

According to the user manual (http://h10032.www1.hp.com/ctg...), page 13, there is an action button at the top of the keyboard "To deactivate or activate the keyboard illumination". However, I cannot say whether this works on all models.

Laut dieser Seite ja. "Backlit Keyboard" checkmark
http://laptopmedia.com/laptop-spe...