Hay! Mac users! Some nice software.
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Ever since getting my Mac Studio, I've been frustrated by the fact that I can't control brightness, contrast or input on my external LG monitor. Any such change requires a trip to the cumbersome button on the bottom of the monitor and wading through menus. This was never an issue on my iMac, since there's such a tight integration of hardware and software.
There's an app that solves this problem.
Once installed, you can assign whatever keys you want to control the monitor. Seems to work just fine for now.