New answers tagged high-definition
Updating Iceweasel to 38.2.1esr-1~deb8u1 resolved the issue. Out of the box only 720p is available but activating mediasource extentions as described above (not all steps necessary) unlocked the 1080p resolution.
4K output with Intel HD 4000 graphics via HDMI 1.4 works for me. Both under Win10, as well as Ubuntu 15. In Win 10 you have to force the graphics to use the stock Microsoft driver (graphic card settings - update driver - choose from disk - Microsoft) NOT the Intel driver which gets enabled by default. Intel Corp. is capping the max resolution, forcing you ...
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