Hi I have just installed Elementary OS Loki 0.4.1, on to my acer aspire 5742 PEW71 laptop. I have it dual booted with windows 7 which can alter screen brightness, however when i change the brightness in windows 7 it does not alter Element OS. It has received all the latest updates and have tried the following:
xbacklight
cd /sys/class/backlight/*/ sudo chmod 777 ./brightness sudo echo $(cat max_brightness) > ./brightness``