Brightness fn keys not working on an Acer Aspire 5742g

zhuks Posts 1 Registration date Saturday October 17, 2015 Status Member Last seen October 17, 2015 - Oct 17, 2015 at 11:33 AM
I have Acer Aspire 5742g and my brighteness fn keys not working....
Also when I click fn + left arrow than I can "change" screen size or if I click more time than my Cinnamon crashed!
Maybe someone knows how I can change to keys are working how it must work and what exactly I do with Fn + left arrow???