I have same display card and same problem here. xrandr can't detect any
hdmi input, i am trying to connect a projector. Connection with vga is
ok.

And while using nvidia-current driver, lspci -v output has something
like this:

01:00.0 VGA compatible controller: NVIDIA Corporation GF106 [GeForce GT 555M] 
(rev ff) (prog-if ff)
        !!! Unknown header type 7f

It did not show the kernel module. Please help, i want to fire this
display card, this laptop and the engineers who are working on nvidia
and developed silly optimus settings.

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https://bugs.launchpad.net/bugs/930587

Title:
  HDMI output

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