External Displays won't come back on

I have the original 27" LG UltraFine 5K display. Even after this update, still have to unplug the TB3 cable and plug in again to get the external display to wake up. Of course, the update reference to external display is only related to color. Pretty pathetic that Apple can let this go on so long.

I tried resetting PRAM and SMC multiple times (lol yes i did the multiple cycles as is suggested earlier in this thread) when I was on 10.15.3 and the issue still showed up if I didn't disable the sleep setting.

Very much doubt it'll change anything doing it again in 10.15.4. The kernel panics really seem to indicate this is a driver issue Apple or its GPU vendor need to address.

Go to Energy preferences and stop your computer from going to sleep while it is plugged in. You can let the screen turn off. But don’t let it go to sleep.

This problem is exclusively related to the computer sleeping while it is plugged into external monitors. Stop it from doing that and you won’t have the problem. I have had zero issues for three months.

Not just the LG monitors. I have a 5KLG as Monitor 1 and an older apple Thunderbolt display as Monitor 2 (MacBook Pro 16 is monitor 3). When it wakes up, the Thunderbolt is the one that doesn't come back on.

So I prevented the laptop from going to sleep. It seemed to have worked for a week, before it crashed. Also a new symptom for me is that my laptop ended up constantly rebooting continuously. I think there is a sensitive component on these things.

I am super glad I didn’t update.

I am running 10.15.1 after having my machine’s motherboard replaced.

It’s still a bit buggy. After several weeks with it back home, the color profile either goes milky or heavily contrasted after the screen goes to sleep. I’ve turned that function completely off in Energy Saver and Displays. Now, it’s just the screensaver that turns on after 30 mins of idle.

Ive noticed the temp and CPU loaf jump from 1.3/1831 - 4/4800 but it hasn’t kicked on the fans or anything.

Turbo Boost and the temp of the machine still goes bananas when using a screen record software and photoshop. It isn’t as obnoxious as it was before when I felt like the MBP was about to take off for a Mission to Mars and/or join the other AÍ from HER.

These machines get a little silly when the battery power falls below 50% and you’re running GPU intensive operations including using an external monitor.

My advice: Make sure you’re using the correct power adapter and cable from Apple, trade out the motherboard if you’re experiencing serious issues, stick to 10.15.1 until another brave Apple monk eats the OS and doesn’t die. It’s how the Taoist discovered their secrets. Can’t hurt us in this situation. Just our computers. (I hope Skynet isn’t still monitoring my online activity)

Good luck everyone!

All ready have that option ticked, still got the problem.

This is what I have with zero problems.