450.80 not detecting second HDMI display

I’ve performed a clean install of Debian Unstable to a new laptop (Dell Vostro 7500) and the external display is not being detected correctly.
The configuration works find using an Ubuntu 20.04.1 live image.
See attached logs

nvidia-bug-report.log.gz (117.3 KB)

Plain Debian doesn’t have the infrastructure to support hybrid graphics, you’ll have to set this up manually:
Optimus Howto