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Dell XPS 12 and HDMI via displayport not working

Hi,

I have a HDMI cable and a Displayport 2 HDMI adapter (purchaced with the XPS 12) which works fine with another Dell laptop, but not with my new XPS 12.

There is no signal at all. When I select "Duplicate" screening, the resolution is changed on the XPS 12 to what looks like 4:3. If I select "Projector only", it falls back to "Duplicate" after a short time with a message indicating no-success (cannot recall the message). I have tried the setup on a Samsung TV and a brand new projector. As mentioned, the cable pair works fine with another older Dell laptop.

Have anyone else experienced this problem?

Any input is highly appreciated.

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