To answer your question as to how to determine the CL of your machine (via software), AFAIK there is not an OSX app for that (I have looked and only found Intel's MacCPUID, which while interesting, unfortunately doesn't provide the CL).
However, what you can do is run BootCamp and get Windows running and then use CPU-Z. This is a method known to work (see ...
It sounds like a networking issue, maybe bad ethernet cable/ends or interference with wifi or failing wifi chip. I would recommend running a network test between two devices on your network and look for dropped packets. You said you are using Chrome... does it do the same with another browser?
LG's website for your model says that it can provide 85W of charging power and specifically mentions MacBook Pros.
Try disconnecting and reconnecting the Thunderbolt cable after disconnecting the Apple charger. Your MBP likely can only accept power from one device at a time, and it probably prefers Apple chargers. So it probably told the LG monitor not to ...
Assuming your "LG Electronics Ultrafine 27-inch external monitor" is the 27MD5KL 5K display that Apple co-developed with LG and resells through the online Apple store, then it's important to note a few things:
That display needs to be connected directly to an actual Thunderbolt 3 port, not just any USB Type-C port. Some of the external USB hubs/...
Lucas Fais's answer about Amphetamine is great, but if you don't trust third party apps, or don't want to support something called "Amphetamine"... Below you will find a fully-native way to do this on a Mac without any third party apps.
It takes like 5 minutes to set up (all steps below), and let's you enable an intelligent No Sleep Mode with just ...
Thank you @Tetsujin, you solved the problem. To restate your solution using more words: Click on the "Movie Recording" window of QuickTime. Notice the "v" to the right of the red "record" button. Click the "v" and then there is a pulldown menu with three subdivisions: Camera, Microphone, and Quality.
In 2020, I believe Amphetamine app is the best way to achieve that.
I was able to create a trigger based on whether external monitor is plugged or not and battery level. Awesome!
My trigger setup