HDMI not recognised

[Anton Shterenlikht]

I've never used HDMI before, so I might be doing
something stupid.

This is Dell Latitude 3340 laptop with 10.1-release.
I connected an hdmi monitor to it.
On boot everything is shown on the laptop
screen, nothing goes to hdmi monitor.

In dmesg I see:

 dmesg | grep -i hdmi
pcm0: <Intel Haswell (HDMI/DP 8ch)> at nid 5 on hdaa0
pcm1: <Intel Haswell (HDMI/DP 8ch)> at nid 6 on hdaa0
pcm2: <Intel Haswell (HDMI/DP 8ch)> at nid 7 on hdaa0

Is that all that's expected? Or should there be more?

There is also a usb cable from the laptop to the
monitor. I think it's something to do with the sound.
At least I see in dmesg:
uaudio0: <DELL DELL UZ2315H, class 0/0, rev 2.00/13.08, addr 2> on usbus0

where UZ2315H is the monitor model.

Full dmesg:
 http://eis.bris.ac.uk/~mexas/log/latitude3340.dmesg

 pciconf -lv|grep -i hdmi
returns nothing. Is that expected?

The monitor simply says there's no
input signal coming.

Please advise

Thanks

Anton