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[Milton <1426751@xxxxxxxxxxxxxxxxxx>]

(Sorry, the message was sent unintentionally)

Thank you Brian.
I removed all the suspicious PPAs using ppa-purge (sudo apt-get install ppa-purge)

sudo add-apt-repository ppa:xorg-edgers/ppa (just in case you had disabled the ppa before(
sudo apt-get update (idem)
sudo ppa-purge  ppa:xorg-edgers/ppa
sudo add-apt-repository --remove ppa:xorg-edgers/ppa  (I don't remember if this is necessary or if ppa-purge already does this)

 the same with ppa ppa:bumblebee/stable

then 
sudo apt-get purge xserver-xorg*
sudo apt-get purge nvidia*

then 
sudo apt-get install nvidia-331
sudo reboot

after reboot, not only everything works perfectly (plugin or unplugging
the external monitor, suspending, etc) but the hardware graphic
acceleration is faster than ever! (running glxspheres )

THANK YOU!!

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to ubuntu-meta in Ubuntu.
https://bugs.launchpad.net/bugs/1426751

Title:
  Ubuntu-desktop not working when suspend/resume or connecting an
  external monitor -after upgrade this week (14.04)

Status in ubuntu-meta package in Ubuntu:
  New

Bug description:
  I was happily using 14.04 with my Lenovo Y50. When I installed it, I
  had some troubles making my NVIDIA GeForce GTX 860M 2GB works with
  hardware acceleration, etc, but at the end everything was OK.

  THIS WEEK (around 02/25/2015) an update destroyed this beautiful
  equilibrium: I can't resume after suspend and I can't plug or unplug
  my external monitor without having a weird problem:

  a) Desktop "moves" half of it size to the right.

  b) Mouse works, but I can't click on anything. The only workaround is
  killing the Xorg, and loosing the session.

  What I tried, without success:

  1) Downgrade Compiz (the first suspect, it was upgraded this week).
  Nothing.

  2) Install ALL possible NVIDIA drivers:

  2.a) Nouveau

  2.b) Nvidia 304 & Nvidia 304 updates (blacklisting and purging
  nouveau)

  2.c) Nvidia 331 & Nvidia 331 updates (both from repository and NVidea
  website). (blacklisting and purging nouveau)

  2.d) Nvidia 340 (from Xorg-edgers ppa). (blacklisting and purging
  nouveau)

  2.e) In every case, I purged previous drivers before, reconfigure
  Xorg, etc, etc,etc.

  3) Reinstalling Unity and Ubuntu-desktop

  I honestly don't know what else to do, but this situation it's very
  annoying.

  Any ideas? Please?

  THANK YOU

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-desktop 1.325
  ProcVersionSignature: Ubuntu 3.13.0-46.76-generic 3.13.11-ckt15
  Uname: Linux 3.13.0-46-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Feb 28 14:21:26 2015
  InstallationDate: Installed on 2014-11-19 (101 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-meta
  UpgradeStatus: No upgrade log present (probably fresh install)

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