[matwood]

I think they are still working through some external monitor driver issues. The colors on my LG 4k were initially way off until I did an advanced calibration. Occasionally waking up from sleep it will revert, but opening the Display preference and swapping between the calibrations fixes it. My connection is through usbc.

I don't have any performance issues waking up though.

[rootusrootus]

I think there are a couple issues going on with the colors. For some people it is calibration. But what I experience is almost like a color inversion (but it's not a full inversion, it looks like maybe one or two channels got inverted). Makes it difficult to even find the mouse pointer so I can get to the menu and reboot the machine. Then it comes up fine.

[matwood]

Interesting. I did submit a bug to Apple about my issue. Mainly because I never did a calibration with my 2017 mbp and the monitor looked great. With the M1 MBA I had to do the advanced calibration just to make the same monitor usable. Otherwise the colors were completely washed out. It almost seemed like the setting to auto-dim the laptop monitor was also being oddly applied to the external.