"MacOS 10.15 Catalina Bug: LG 5K Display Resets to Maximum Brightness Every Reboot"
Oof, I'm glad I haven't upgraded to Catalina yet. I use this display, and this behavior would drive me batty.
MacOS 10.15 Catalina Bug: LG 5K Display Resets to Maximum Brightness Every Reboot
Link to: https://macperformanceguide.com/blog/2020/20200107_1436-2019MacPro-LG5K-maximum-brightness-after-reboot.html