https://bugzilla.kernel.org/show_bug.cgi?id=94061
--- Comment #2 from Klaus Maier abcdmail@freenet.de --- Yes - backlight management is switched off because it doesn't work at all w/ catalyst. Always full. Brightness, ... - it's all configured by the monitor itself. Management via KDE or software is done only for on or off (switching monitor to standby) - nothing more.