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[Launchpad Bug Tracker <1210077@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package nvidia-graphics-drivers-331 -
331.20-0ubuntu0.0.2

---------------
nvidia-graphics-drivers-331 (331.20-0ubuntu0.0.2) precise-proposed; urgency=medium

  [ Shih-Yuan Lee (FourDollars) ]
  * debian/nvidia_supported,
    debian/rules:
    - Add subsystem ID parsing support for LP: #1255813.

  [ Alberto Milone ]
  * debian/dkms_nvidia/patches/register-VT-switch-requirements.patch:
    - Make sure to call pm_vt_switch_{required,unregister}(), so that
      the kernel knows that the driver requires a vt switch at
      suspend/resume time. This resolves a corruption issue on resume
      from S3 (LP: #1210077).
      Thanks to NVIDIA for the patch.
  * debian/dkms_nvidia_uvm/patches/buildfix_kernel_3.12.patch,
    debian/dkms_nvidia/patches/buildfix_kernel_3.13.patch:
    - Add support for Linux 3.13 (LP: #1294163).
 -- Alberto Milone <alberto.milone@xxxxxxxxxxxxx>   Thu, 20 Mar 2014 11:50:12 +0100

** Changed in: nvidia-graphics-drivers-331 (Ubuntu Precise)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1210077

Title:
  Screen freeze and garbled after resume from suspend

Status in HWE Next Project:
  Fix Released
Status in HWE Next trusty series:
  Fix Released
Status in Unity:
  Fix Released
Status in “nvidia-graphics-drivers-331” package in Ubuntu:
  Fix Released
Status in “nvidia-graphics-drivers-331-updates” package in Ubuntu:
  Fix Released
Status in “unity” package in Ubuntu:
  Fix Released
Status in “nvidia-graphics-drivers-331” source package in Precise:
  Fix Released

Bug description:
  [Impact]
  Users of nvidia graphics drivers can see graphics freezes or corruption after suspend/resume. Switching to a VT and back to X can potentially solve freeze issues, but corruption may result.

  [Test Case]
  Suspend/Resume many times with nvidia graphics and see if the problem happens.

  [Regression Potential]
  This is already in Trusty.

  --

  Perform regular suspend, either from system menu or close laptop lid,
  when system resuming from suspend, it will freeze.

  Switch to VT and back to X can solve freeze issue,
  but the screen are gabled and some character rendering are strange,
  however whole system can perform usual task.

  found affected graphics:
  gf108m
  gf117m
  gk107glm

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