It looks like this laptop has hybrid graphics, ie. an integrated Intel
"Ironlake" GPU on the "Arrandale" Core i3 M380 CPU and a discrete AMD
GPU (possibly a Radeon HD6370M?).  The HDMI port is probably connected
to the AMD GPU.

There is not much support for this configuration under Ubuntu, Fedora,
OpenSUSE or any other version of Linux. However, you can try the
vga_switcheroo feature in the open-source drivers - see
http://www.phoronix.com/scan.php?page=news_item&px=Nzk0OQ and
http://www.phoronix.com/scan.php?page=news_item&px=Nzk1NQ

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https://bugs.launchpad.net/bugs/883877

Title:
  no HDMI output on HP pavilion dv6 (6250)

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