On Thursday, January 12, 2017 1:43:38 AM CET Richard Waterbeek wrote: > I noticed that the values there don't seem to have a direct relation > with the actual brightness.
No, in my case they do relate with brightness. > What I mean with that is, I tap the function key three times down and > three times up, the backlight comes back to it's original luminance. > When I echo to that file the value shown at three times down, the > backlight changes, but after this, I can't get it to it's original > setting, with echoing the value that was shown. After this, by using the > function key, down and up, till I can tell it is the same luminance, > then the value shown isn't any longer the same. This works different in my system. If I reduce the brightness by half with F- keys, actual_brighness changes from 1388 to 763. If I go back to maximum brightness, and then echo 763 to brightness, the screen brightness is indeed half, as expected. > Are you sure you need to switch the backlight off I ask. This is what happens with the standard KDE's power management funtionality. After some time the system is inactive, the screen is turned off.
