How many external screens does the FW13 7840U support

So I have a FW13 with 780M Graphics.
I’ve also got 2 screens connected to a USB-C Dock.
1 of the screens always works but never both at the same time.

I’m trying to figure out of its a dock issue or a limit of the 780M.
Screens are 3440x1440 and 1920x1200.

At the moment I just work with the dock and 3440x1440 screen.
Any advice would be appreciated

thanks for the links, so its basically a dock issue

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