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[Alberto Milone <alberto.milone@xxxxxxxxxxxxx>]

I'm going to introduce nvidia-340 and nvidia-346. At least the former seems to support your GPU:
http://us.download.nvidia.com/XFree86/Linux-x86_64/340.76/README/supportedchips.html

That should solve your problem.

Sorry for the inconvenience.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to nvidia-graphics-drivers-331-updates in
Ubuntu.
https://bugs.launchpad.net/bugs/1402423

Title:
  Security update removes previously working graphics card

Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-331-updates package in Ubuntu:
  Confirmed

Bug description:
  The Ubuntu Trusy repositories have version 331.38-0ubuntu7 which is a
  working driver for the NVIDIA 820M card.

  trust-security updates the driver to 331.113-0ubuntu0.0.4 which
  removes the support for the 820M.

  When attempting to [code]modprobe nvidia-331[/code] with version
  331.113 I receive the following message in /var/log/kern.log:

  Dec 14 12:26:32 mirror kernel: [23225.879952] pci 0000:04:00.0: Refused to change power state, currently in D0
  Dec 14 12:30:26 mirror kernel: [23459.429826] NVRM: The NVIDIA GPU 0000:04:00.0 (PCI ID: 10de:1140)
  Dec 14 12:30:26 mirror kernel: [23459.429826] NVRM: installed in this system is not supported by the 331.113
  Dec 14 12:30:26 mirror kernel: [23459.429826] NVRM: NVIDIA Linux driver release.  Please see 'Appendix
  Dec 14 12:30:26 mirror kernel: [23459.429826] NVRM: A - Supported NVIDIA GPU Products' in this release's
  Dec 14 12:30:26 mirror kernel: [23459.429826] NVRM: README, available on the Linux driver download page
  Dec 14 12:30:26 mirror kernel: [23459.429826] NVRM: at www.nvidia.com.
  Dec 14 12:30:26 mirror kernel: [23459.429836] nvidia: probe of 0000:04:00.0 failed with error -1
  Dec 14 12:30:26 mirror kernel: [23459.430539] NVRM: The NVIDIA probe routine failed for 1 device(s).
  Dec 14 12:30:26 mirror kernel: [23459.430541] NVRM: None of the NVIDIA graphics adapters were initialized!
  Dec 14 12:30:26 mirror kernel: [23459.430542] [drm] Module unloaded
  Dec 14 12:30:26 mirror kernel: [23459.430630] NVRM: NVIDIA init module failed!

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