> (this includes the small things, such as responding to the Brightness function key) The sad part — that seems to play yet again — is that there's a standard

> (this includes the small things, such as responding to the Brightness function key) The sad part — that seems to play yet again — is that there's a standard just for that: DDC/CI. But none of the GPU vendors nor display vendors care enough to make it work reliably, if at all (apparently it's mostly used for automated display calibration, so if you fall out of that use case, tough luck). I effectively hacked quite a lot of things around it, and ended up frying a couple gfx cards, because you can easily shoot yourself in the foot, write to the wrong part, and end up with a PCI card as useful as a waffle, only inedible. In the end I managed to pass some commands in very specific scenarios, but behaviours ended up highly dependent on the GPU, display, and combinations thereof I had available (from nothing, to glitchy screen, to aforementioned waffle, but it did work in one specific case \o/).