Cannot turn off automatic brightness adjustment on CB272U

sethmad
sethmad Member Posts: 1 New User
I just hooked up a new CB272U to a MacBook Air (13" 2017 running 11.1) via DisplayPort. It's working fine, except that the monitor is constantly automatically readjusting the brightness. I have disabled automatic brightness adjustment in my System Preferences without effect. The MacBook screen's brightness does not automatically adjust.

I notice the ACM setting is grayed out to OFF in my OSD, and I cannot change it. 

Also, I have adjusted/saved my user settings so that Super Sharpness is turned OFF. However, every time I turn off the monitor or the MacBook, that setting reverts to ON.

Any ideas?