The problem is this laptop uses optimus and the digital output
connectors are only physically hooked up to the nvidia gpu while your
internal display runs off of the intel gpu which is a combination that
is not supported in linux yet. You may be able to force the system to
only use the nvidia in the bios on your machine, a lot of systems like
this have that option. Alternately you may be able to force the nvidia
to be used by adding acpi_osi="!Windows 2009" to your kernel command
line, that will force it into windows XP compatibility mode where
optimus doesn't work.

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https://bugs.launchpad.net/bugs/1112859

Title:
  Optoma HD20 projector recognized but no HDMI signal

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