https://bugs.kde.org/show_bug.cgi?id=494730
--- Comment #4 from hacker1...@users.sourceforge.net --- (In reply to Jakob Petsovits from comment #2) > Thanks. That's interesting, and unexpected, because generally the backlight > brightness code takes all available "backlight" class devices, ignores some > depending on "type", and treats the filtered set as a single display. (It's > generally hard or impossible to tell which backlight device corresponds to > which actual screen, or if they even correspond to different screens at > all.) So what's most surprising to me about your case is that you actually > have two sliders for "Built-in Screen". > > Could you confirm that the two sliders actually come from the service, > rather than being a bug in the applet? Please invoke this in a terminal and > paste the result to confirm that the service actually exposes two different > displays: > > > busctl --user get-property org.kde.ScreenBrightness > > /org/kde/ScreenBrightness org.kde.ScreenBrightness DisplaysDBusNames $ busctl --user get-property org.kde.ScreenBrightness /org/kde/ScreenBrightness org.kde.ScreenBrightness DisplaysDBusNames as 4 "display3" "display1" "display2" "display0" I currently have two external monitors connected as well, so this does mean that each internal display is represented individually. Something I've noticed since filing this bug report is that there are brightness sliders for external displays as well, but these do not actually send DDC/CI commands; it seems that they just add an artificial dimming filter. My hunch is that the code responsible for creating these artificial brightness sliders is failing to recognize that the real kernel backlight interfaces can control the lower display as well, and so a dimming filter is also available for it. That explains the additive behavior - one slider adjusts both displays, and the second applies the filter to the lower one, which is hard to distinguish from a real brightness change on OLED. An easy fix would be to make sure no filters are available for any eDP displays. -- You are receiving this mail because: You are watching all bug changes.
