Any problems using a M1 Macbook pro with a 34" ultrawide external monitor
Solution 1:
I use a 34" 34GK950F with a M1 Air and it works fine at 60hz, using a usb-c -> DisplayPort cable. I've had no issues with VSC or any of my dev tools using it.
The M1 only supports one external monitor (up to 6k/60hz), although it seems some people have used displaylink to add more but you run into incompatibility issues: https://www.macworld.co.uk/how-to/how-connect-two-or-more-external-displays-apple-silicon-m1-mac-3799794/