MacOS 10.15 Catalina Bug: LG 5K Display Resets to Maximum Brightness Every Reboot

John Gruber on Daring Fireball:

A DF reader — also a professional photographer — wrote to me about this bug last week. He (the DF reader) was using a $6,000 new 16-inch MacBook Pro. I say _was_, past tense, because after a few days he returned it because this brightness issue was no small thing for him, because he sets his display brightness _precisely_ using a display calibrator. Doing this several times per day every day quickly drove him mad.

Is this the worst bug in the world? Not even close. It’s a paper-cut bug. No data loss, no crash, not something sort of thing where something doesn’t even work — just an annoyance. But no one wants to use a tool that gives you half dozen paper cuts every day. And MacOS 10.15 is chockablock with paper-cut bugs. And it’s not like the LG 5K Display is some obscure unsupported display — it’s the one and only external 5K display sold by Apple itself.

I finally made up my mind today to update to Catalina. I have since backtracked and will continue waiting for them to fix all the bugs, so maybe I’ll reconsider an upgrade in another 3 months or so.