displays not detected in ubuntu 22.10 kernel 5.9.0-23

I've got a Dell Latitude 5521 running Ubuntu 22.10. It's connected to a Wavelink USB3 port replicator which is driving 2 external monitors via HDMI. When I boot into the latest kernel (5.19.0-23), it cannot see the 2 external monitors. BUT... when I boot into kernel 5.19.0-15, the 2 monitors are there no problem. Per the instructions here () I'veremoved displaylink rebooted removed evdi 1.11 removed evdi 1.12 re-installed linux headers re-installed displaylink , ...and rebooted again just for good measure. No joy. xrandr --listproviders says: Providers: number : 1 Provider 0: id: 0x46 cap: 0x9, Source Output, Sink Offload crtcs: 4 outputs: 4 associated providers: 0 name:modesetting

UPDATE: less joy than before 

UPDATE: I removed everything, re-installed, and now the displays are dark in both kernels. Yay for consistency, I guess? Still, I really REALLY would like to get my other monitors working.

UPDATE: fixed - disabling secure boot was the key 

Welp, I went back into BIOS to double-check secure boot and sure enough it was on, and sure enough disabling it immediately allowed the external monitors to work. So for future generations, here's a potential answer. Good luck!