when changing brightness via the slider accessible from the battery icon the on screen display works fine. In both cases, the brightness does change as it should. I guess this might depend on the setup, so here is what I am using: Dell XPS13 "Sputnik" (ubuntu version) with BIOS A07, kernel 3.8.0-26-generic, kubuntu 13.04 fully updated Reproducible: Always
same here on lenovo x220 and x230
Same here on Lenovo T440. Just to clarify things: - Brightness change via Fn keys: works, but there is no OSD and the slider in the battery widget is not updated. - via widget slider: OSD is shown and of course the slider is "up-to-date" afterwards Assumption: The Fn keys "bypass the way through KDE". Can it be that KDE checks if the brighness changing shortcuts are pressed? Because when I remap those shortcuts to "normal" ones (e.g. Ctrl + u etc...), everything works as expected. In that respect, there seem to be two solutions in my eyes: 1. watch the corresponding file in /proc 2. fix the problem at shortcut-level, so that the brightness Fn keys are recognized. Additional Info: If I try to map Fn + BrightnessUp/Down to other actions, my system does NOT recognize that I just pressed Fn + BrightnessUp/Down and just keeps waiting. Even 'xev' does not register those keys. Boot params: acpi_osi= (yes, without anything behind the equality sign) Regards
Hi all, Fixed it for me on Lenovo T440p https://bugs.kde.org/show_bug.cgi?id=323516#c24 Regards
Most likely a driver/ACPI issue.