MetaNorm Solus can't detect via HDMI connected devices?
I'm guessing that must be a local problem, perhaps a hardware incompatibility of some kind. Since the monitor works on another machine, I suspect the video card and driver may not agree with each other, so you might be right about a driver update causing the issue..
My media machine is an HP desktop that connects to my Samsung TV via HDMI, and always has done so flawlessly. My main workstation is one I built, and it connects to two full HD monitors via HDMI. Another older workstation I plan to use as a utility server connects to its one HD monitor via HDMI.
All these machines are running Solus, mostly Budgie. The media machine runs MATE. All the computers are fully updated as of last Friday.