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[Johnny Arthur <1574732@xxxxxxxxxxxxxxxxxx>]

I just upgraded to 16.04 and can't log in any longer with the latest
(default) kernel 4.4.0-21. If i select an older kernel (4.2.0-35)
everything works fine. Trying to load nvidia drivers manually say
something like 'required key missing' (i would have to reboot with the
latest kernel to see the exact wording however).

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https://bugs.launchpad.net/bugs/1574732

Title:
  Regression: Kernel Update in 16.04 from last days renders nvidia
  driver unusable

Status in linux package in Ubuntu:
  Confirmed
Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  I am running Ubuntu 16.04 since at least four months, always with the
  nvidia proprietary drivers (installed from the repository). I used
  nvidia-361 for a while with no issues (and i need it for steam
  gaming). However, an update installed on my machine yesterday breaks
  the nvidia drivers. I tried purging the driver, rebooting and
  reinstalling and i tried a newer version for the ubuntu-drivers ppa.
  Nothing helps: With the nvidia driver installed, i get a low-
  resolution login screen, but cannot login due to missing 3d
  acceleration. Running on nouveau works fine.

  This seems very strange to since everything worked until this
  afternoon. Yesterday, i was happily playing games on steam, installed
  some updates and now, my graphics are broken.


  
  $ lspci | grep NVIDIA
  01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750] (rev a2)
  01:00.1 Audio device: NVIDIA Corporation Device 0fbc (rev a1)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2
  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
  Date: Mon Apr 25 17:45:12 2016
  DistUpgraded: 2016-03-11 21:34:38,175 DEBUG enabling apt cron job
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.8, 4.4.0-21-generic, x86_64: installed
   virtualbox, 5.0.18, 4.4.0-18-generic, x86_64: installed
   virtualbox, 5.0.18, 4.4.0-21-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   NVIDIA Corporation GM107 [GeForce GTX 750] [10de:1381] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: Palit Microsystems Inc. GM107 [GeForce GTX 750] [1569:1381]
  InstallationDate: Installed on 2016-01-05 (110 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed root=UUID=ed669b2d-c3af-4570-9eb7-2978557208ae ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg crash
  UpgradeStatus: Upgraded to xenial on 2016-03-11 (44 days ago)
  dmi.bios.date: 05/18/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.30
  dmi.board.name: H97 Performance
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.30:bd05/18/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH97Performance:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
  xserver.bootTime: Mon Apr 25 17:44:29 2016
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.3-1ubuntu2
  xserver.video_driver: modeset

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