Question: External display won't wake up from sleep
I have a 2017 iMac Retina 4k with an LG Ultrafine 21.5" external display connected using thunderbolt 3 cable (no adapters). Other folks in my office have this working just fine with 2017 macbooks.
The issue Im having is consistent and as follows:
The external LG display works except that it will not wake up from sleep when the iMac does. On top of this, the mouse and other UI components stutter when being moved. Unplugging and plugging back in the thunderbolt cable connecting the display fixes this and resets the displays and turns on the LG.
Its obviously frustrating to have to do this every time the mac needs to wake up from sleep or alternatively setting the mac to never sleep. I've tried various changes to the Energy Saver settings to no avail.