nvidia proprietary driver does not output to HDMI screens

When attaching an external screen to my Macbook Pro 15" Retina the external screen stays blank.
nvidia-settings report the screen correctly.

There are three options to attach a screen:

- HDMI directly
- via Thunderbold port 1 and 2

I use a Moshi adapter.

Cable and adapter used to work properly, HDMI direct worked till 16.04.

Using Nouveau driver the external screen works fine (except for overlapping screens) from TB port 2 and HDMI port.

TB port 1 works fine with VGA.

Thus I presume there is an error in the nvidia 367 driver
(I haven't tried the latest update 375.20 from NVidias site yet)

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: nvidia-367 367.57-0ubuntu3
ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
Uname: Linux 4.8.0-30-generic x86_64
NonfreeKernelModules: nvidia_uvm wl nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Dec 18 14:30:23 2016
InstallationDate: Installed on 2016-10-22 (57 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
SourcePackage: nvidia-graphics-drivers-367
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.modprobe.d.nvidia-367_hybrid.conf: [deleted]