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[j <jonnytup@xxxxxxxxx>]

Same problem as described for me as well

Display freezes, often within 1 minute of start up.  (using menus seems
most dangerous)

Only when using 331.38 ( +update)

works fine with Intel power savings mode (still using Nvidia drivers - settings within  Nvidia X server settings)
ubuntu 14.4
Nvidia Gforce GT750M

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https://bugs.launchpad.net/bugs/1310551

Title:
  NVIDIA proprietary driver 331.38 from package nvidia-331 on Xubuntu
  14.04 causes display to hang

Status in “nvidia-graphics-drivers-331” package in Ubuntu:
  Confirmed

Bug description:
  On 14.04 I am getting an issue on my Thinkpad T520 where running the
  "proprietary,tested" 331.38 driver causes my display to hang. It seems
  to stay that way until I switch to tty6 with ctrl+alt+f6 and then back
  to tty7 which has the display, this causes it to un-hang. This then
  happens back and forth. I am not sure but it might be triggered by
  clicking things, opening windows and such. The problem disappears when
  switching back to the open source driver.

  Should I try an even newer driver from nvidia, or is there any more
  information you need for troubleshooting?

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: nvidia-331 331.38-0ubuntu7
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Apr 21 12:29:36 2014
  InstallationDate: Installed on 2014-03-18 (33 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140318)
  SourcePackage: nvidia-graphics-drivers-331
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.modprobe.d.nvidia.331.hybrid.conf: [deleted]

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