The issue was fixed upstream.

The commit that fixed it:
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?h=linux-3.17&id=6fbb702e27d78ad2458df048b58cca3454bc0965

I tried the ubuntu-utopic kernel with the commit on top, and it works fine 
again.
HDMI gives signal again, no more errors in dmesg, and suspend/shutdown also 
works.

Guess this is a must-have!

** Changed in: linux (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1374607

Title:
  nouveau - HDMI gives no more signal since 3.15 (optimus)

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