I envy the person who has the time to build their own custom rig and even write a device driver to access monitor controls.
I have an Intel NUC running Linux (debian).
About 5 years ago I replaced the case with a fanless case (Akasa). It took very little time, there was just some screws and a cable to attach the USB ports.
The original case with fan was not particularly noisy. But it is just so much more relaxing working or reading without the fan.