Found a solution, thanks to this:
http://nouveau.freedesktop.org/wiki/Optimus/

First, you have to add "drm.rnodes=1" to the kernel parameters: 
https://wiki.ubuntu.com/Kernel/KernelBootParameters
Then, you need to make sure you (the user) are in the video group: sudo usermod 
-a -G video <user>

Reboot, and it should work.

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https://bugs.launchpad.net/bugs/1388647

Title:
  DRI_PRIME=1 has no effect in Ubuntu 14.10

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