External Monitor not detected in Kubuntu 18.04

Hello,
I am not able to enable the external monitor on my laptop Legion y530 with kubuntu 18.04 through hdmi. I tried reinstalling drivers, switching between intel integrated graphic and nvidia, checked /lib/modprobe.d/nvidia-kms.conf and other solutions…and it seems all ok. The installed drivers are the last version 450.

I attach the gz with the result from nvidia-bug-report.sh nvidia-bug-report.log.gz (92.2 KB)

Thanks