Thanks for the reply again--I appreciate the tips.
>>I use the "looks like" resolution as standard for a 27" screen of 2560x1440. I do not recommend to choose any other since the scaling of the Mac OS will otherwise not fit the physical resolution of the display. 5K is exactly the double in each dimension of 2560x1440.
Interesting; I am running the LG at the "More Space" (looks like 1920x1200) option and the MBP at the "More Space" (looks like 3200x1800) option as well. I don't understand your comment about scaling Mac OS not fitting the physical resolution of the display. Can you explain further?
Regarding the LG Utility
I didn't read the manual, but apparently there is a reference to this in it
The link is:
http://www.lg.com/us/support-product/lg-27MD5K#Also, I thought the LG had an ambient light sensor. I noticed from your screenshot that there is no option to automatically adjust brightness; I don't see that option on my display preference either. Shouldn't that be there?
For what it's worth:
When calibrating my iMac screen with DisplayCal, I use a command line utility that I found called "brightness" that lets you enter numerical values rather than using the slider. It's great for making small incremental adjustments so that you can hit a specific measured brightness target during setup. I have yet to try it with the LG...I'm wondering if it's possible to target a specific display with that control...and will report back.
Lastly...that banding I saw must have been during a reinstall of macOS. I don't see any banding now!