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[sohel <sohelmk@xxxxxxxxx>]

The original issue reported in this bug (unable to get login window) is resolved but external monitor is no longer working.
Earlier it worked without any issues.

Ubuntu 14.04 on Lenovo W530

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https://bugs.launchpad.net/bugs/1365695

Title:
  No longer able to use GUI after update

Status in HWE Next Project:
  New
Status in nvidia-graphics-drivers-304-updates package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-331-updates package in Ubuntu:
  Confirmed
Status in ubuntu-drivers-common package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed
Status in xserver-xorg-video-intel-lts-trusty package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-304-updates source package in Trusty:
  Confirmed
Status in nvidia-graphics-drivers-331 source package in Trusty:
  Confirmed
Status in nvidia-graphics-drivers-331-updates source package in Trusty:
  Confirmed
Status in ubuntu-drivers-common source package in Trusty:
  Triaged
Status in xserver-xorg-video-intel source package in Trusty:
  Fix Released
Status in xserver-xorg-video-intel-lts-trusty source package in Trusty:
  Confirmed

Bug description:
  Until yesterday the 14.04 install on this Thinkpad T530 (nvidia
  Optimus) with nvidia-331 drivers worked just fine, including excellent
  multi-monitor behavior. Yesterday the set of packages below [1] was
  updated. I shut down, booted this morning and found out that I was not
  shown the lightdm login screen: I was stuck at the purple screen that
  precedes it (into which I enter my disk encryption password).

  Now the funny thing is that I could hear the lightdm startup sound and
  could actually login by typing my password (disk activity and started
  processes verify I am actually logged in), but I can't see anything:
  I'm still stuck at the puple screen.

  Uninstalling the nvidia drivers solved the problem: I'm typing this in
  a browser window using the nouveau drivers.

  I atttempted switching to nvidia-304, but that doesn't work either.
  Using those drivers I am shown the lightdm login screen, but after
  logging in I'm stuck with a screen showing only the background image.
  Nothing else is available, no keyboard or mouse trickery will reveal
  any menu, dialog or terminal to gain access.

  Since nouveau doesn't support a multi-monitor setup, it would be great
  if I someone could tell me how to get the nvidia drivers working
  again.

  Some things I noticed:
  - .xsession-errors reported 'Xlib:  extension "GLX" missing on display ":0"'
  - /var/log/Xorg.0.log reported 'setversion 1.4 failed: Permission denied'

  [1] The packages that were updated:

  Start-Date: 2014-09-03  15:07:38
  Upgrade: libsystemd-login0:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), systemd-services:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), librbd1:amd64 (0.80.1-0ubuntu1.1, 0.80.5-0ubuntu0.14.04.1), ubuntu-drivers-common:amd64 (0.2.91.5, 0.2.91.6), libsystemd-daemon0:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), libgudev-1.0-0:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), libgudev-1.0-0:i386 (204-5ubuntu20.4, 204-5ubuntu20.5), libpam-systemd:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), librados2:amd64 (0.80.1-0ubuntu1.1, 0.80.5-0ubuntu0.14.04.1), shotwell-common:amd64 (0.18.0-0ubuntu4.1, 0.18.0-0ubuntu4.2), udev:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), shotwell:amd64 (0.18.0-0ubuntu4.1, 0.18.0-0ubuntu4.2), gir1.2-gudev-1.0:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), libudev-dev:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), libudev1:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), libudev1:i386 (204-5ubuntu20.4, 204-5ubuntu20.5), xserver-xorg-video-intel:amd64 (2.99.910-0ubuntu1, 2.99.910-0ubuntu1.1), libsystemd-journal0:amd64 (204-5ubuntu20.4, 204-5ubuntu20.5), rsyslog:amd64 (7.4.4-1ubuntu2, 7.4.4-1ubuntu2.1)
  End-Date: 2014-09-03  15:08:06

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: nvidia-current-updates (not installed)
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Sep  4 22:07:11 2014
  SourcePackage: nvidia-graphics-drivers-304-updates
  UpgradeStatus: Upgraded to trusty on 2014-06-03 (93 days ago)

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