Mac Mini 2019 with Razer X Chroma & 5700 XT - No display when woken from sleep
I have an LG 5k (only USBC connection) connected to my Mac Mini and another LG 4K monitor connected to my Razer X Chroma (via HDMI).
Upon boot up or restarts both Monitors turn on without any issues, however if i sleep the Mac or wake it up in the morning the monitor connected to the Razer X Chroma does not come on. I can move my mouse to it but the display is black. The way I fix it is to go to Display settings and click on Gather windows and uncheck HDR or change a setting to trigger the monitor to turn on and continue my work.
Does anyone know how I can fix this?
Also, is it recommend to use HDMI or Displayport to the EGPU ? which is better?
Are you running at least 10.15.6?
Others here report fewer problems with Display Port.
On that second LG 4K monitor, try the second HDMI port and see if the sleep/wake problem clears.
I had the same issue (dual LG 4K monitors) and that fixed it. It's a mystery. I don't know why it works, and neither did the person who recommended it to me.
I had some issues with DP that I think are related to HDR, so I switched back to HDMI.