Hi ATDrake. Thanks for the response. Unfortunately that didn't worked out. Both PRAM and SMC are reset.
It looks like OSX 10.11.4 broke it (since a clean test machine did work under 10.11.3 and broke after the upgrade). But sticking to 10.11.3 won't be the solution, of course I can roll back for now.
Hope for a real solution.
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