SUMMARY If you have 2 computers plugged to the same monitor and the computer currently not being displayed dimms the display due to lack of activity, it dimms the display for the computer that is on the monitor. Not sure if there is a way to detect a computer not having its input tuned in, but I'll report this anyways. STEPS TO REPRODUCE 1. Plug 2 computers to the same monitor 2. Do something on one while letting the other go idle OBSERVED RESULT Display gets dimmed even if you're doing something EXPECTED RESULT The computer not on front should detect that it is not and refrain from dimming when it knows it will interfere with the other computer SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.3.4 KDE Frameworks Version: 6.13.0 Qt Version: 6.9.0 Kernel Version: 6.14.4-arch1-2 (64-bit) Graphics Platform: Wayland Processors: 12 × AMD Ryzen 5 2600 Six-Core Processor Memory: 62.7 GiB of RAM Graphics Processor: AMD Radeon RX 5700
I can confirm this bug, although it seems to happen only one monitor of mine and not on other. Can you me which monitor you have?
Created attachment 181035 [details] Displays Asus MG279 and Samsung C27JG5x. I guess some monitors have protections against changing the bringtness from sources that are not allowed. There isn't a need to wait for the computer to dim the screen. Just tweaking the brightness settings is enough.