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[Fabio <1543746@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1543745 ***
    https://bugs.launchpad.net/bugs/1543745

** Summary changed:

- Xorg crash prevents login
+ Cannot log in on unity with nvidia drivers

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https://bugs.launchpad.net/bugs/1543746

Title:
  Cannot log in on unity with nvidia drivers

Status in xorg package in Ubuntu:
  New

Bug description:
  After a recent update, it's no more possible to log in to Ubuntu 16.04
  when using lightdm to access to Unity.

  If I try to login lightdm disappears as if it was loading Unity, but
  after a few seconds the login prompt appears again.

  ### Workaround ###

  Current workaround has been to purge all nvidia drivers, as nvidia-352
  was installed.

  
  The same driver (nvidia-352) works correctly in trusty, and until recently it used to work even on xenial.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu1
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.19.4-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Feb  9 20:11:26 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.8, 4.3.0-5-generic, x86_64: installed
   bbswitch, 0.8, 4.3.0-7-generic, x86_64: installed
   bbswitch, 0.8, 4.4.0-2-generic, x86_64: installed
   psmouse-focaltech, 0.1, 3.19.0-18-generic, x86_64: installed
   psmouse-focaltech, 0.1, 3.19.0-20-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. 4th Gen Core Processor Integrated Graphics Controller [1043:178d]
  InstallationDate: Installed on 2015-03-21 (325 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150321)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0bda:57b4 Realtek Semiconductor Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X550JK
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.3.0-7-generic.efi.signed root=UUID=3eab3ace-7b67-4e6a-aea7-d31b73cc4819 ro quiet splash acpi_osi=
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/08/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X550JK.303
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X550JK
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550JK.303:bd10/08/2014:svnASUSTeKCOMPUTERINC.:pnX550JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X550JK
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  version.compiz: compiz 1:0.9.12.2+16.04.20151211-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.66-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160127-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
  xserver.bootTime: Tue Feb  9 19:54:16 2016
  xserver.configfile: default
  xserver.errors: systemd-logind: failed to get session: PID 926 does not belong to any known session
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1117
   vendor                                     LGD
  xserver.version: 2:1.17.3-2ubuntu2

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