Just upgraded to Big Sur (11.0.1) on a 2018 MacBook Air (retina). I use two external displays through a MediaGear DisplayLink Dual 4K Display monitor hub. Neither external display will now work (both did under 10.15) - they do not show up in the Monitor system panel and they stay blank (no flickering, anything).
The monitors are old, and I'm using VGA to HDMI conversion cables to plug into the MediaLink hub. If I plug in the monitors directly into the MacBook Air through an Apple HDMI to USB-C adapator, one then will now work (a Dell 17") but he other (a Zalmon Trimon 3D) does not. I've tried NVRAM and SMC resets to no avail.
This is a pretty serious problem. I could buy a new monitor, but this seems extreme when it's clearly an issue from upgrading to Big Sur. Also, how can I be sure that a new monitor will work any better?
Advice welcome. I am submitting a bug report as well.
jmberger
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