I’m trying the new brightness control of Plasma 6.2, but does nothing (or my eyes fail 
).
I’m using a MiniPC connected by HDMI with a monitor.
Operating System: CachyOS Linux
KDE Plasma Version: 6.2.1
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.11.3-3-cachyos (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 5800H with Radeon Graphics
Memory: 28.3 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: Trigkey
Product Name: S5