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[Alin Andrei <1301490@xxxxxxxxxxxxxxxxxx>]

I've managed to fix this by blacklisting nouveau:

$ cat /etc/modprobe.d/blacklist-nouveau.conf
blacklist nouveau
blacklist lbm-nouveau
alias nouveau off
alias lbm-nouveau off

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https://bugs.launchpad.net/bugs/1301490

Title:
  "PRIME Profiles" option no longer available in Nvidia Settings

Status in “nvidia-settings” package in Ubuntu:
  New

Bug description:
  After a recent update, the "Prime Profiles" option disappeared from Nvidia Settings. I'm not sure if this is a bug in Nvidia-Settings or something else though... because prime-select doesn't work either:
  $ sudo prime-select intel
  Error: alternatives are not set up properly
  Error: intel mode can't be enabled

  Let me know any info you may need...

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: nvidia-settings 331.20-0ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-21.43-generic 3.13.8
  Uname: Linux 3.13.0-21-generic x86_64
  ApportVersion: 2.14-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Apr  2 19:51:01 2014
  InstallationDate: Installed on 2012-12-30 (458 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  SourcePackage: nvidia-settings
  UpgradeStatus: Upgraded to trusty on 2013-01-12 (445 days ago)

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