I’m having issues with > 1080p resolution and with my bluetooth adapter on a 4th gen (2016) Thinkpad X1. I believe the issues started when Endevour’s LTS kernel changed to 6.6? Seems similar to the issue I was having at https://forum.endeavouros.com/t/update-incl-kernel-6-3-killed-native-monitor-resolution/40421 though that was on a different machine.
I’m going to try building the 6.1 kernel and see if that fixes things.