Hey, guys

I have a laptop, where the function keys for changing brightness don't work.

So, I can set the brightness with xrandr this way:

xrandr --output LVDS-0 --brightness 0.7

But I don't know how to modify this command so it changes the brightness - let say from 0.7 to 0.8. Cause this way I can make two small custom launchers which I will use to increase and decrease screen brightness?

Thanks in advance