LG 49WL95C monitor doesn‘t work anymore after upgrading to OS13 over usb-c

The source for that terminal command suggest you disconnect your external display, so that you can type of the built-in display. Then you have 20 seconds lead-time to re-connect your display, while killing WindowServer logs you out.

This blog (by a self-proclaimed Android and Windows specialist) appears to be an early source for the kill WindowServer work-around:

https://www.droidwin.com/macos-monterey-cannot-detect-second-monitor-external-display-fixed/

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Some people say that 13.0.1 fixed it, but it didn't for me.

But this is a temporary workaround.

Ventura - External Displays not working - Apple Community

Ventura 13.0.1 was issued Wednesday, 9 Nov 2022,

Any changes?

Some users are reporting temporary relief by force-quitting the WindowServer process.

This will log you out, but on logging back in, often the screen is not scrambled.

Only work with usb-c to HDMI port but the resolution is lower than previous (5120 x 1440 with usb-c to Display port) under both of 13.0 and 13.0.1.