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[Alberto Salvia Novella <es20490446e@xxxxxxxxx>]

** Changed in: lightdm (Ubuntu)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1501041

Title:
  No visible display in non gnome sessions when using nvidia drivers via
  nvidia-prime until screen goes to sleep, then waked up

Status in lightdm package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers package in Ubuntu:
  Invalid
Status in ubuntu-drivers-common package in Ubuntu:
  Confirmed
Status in unity-greeter package in Ubuntu:
  Invalid
Status in xfce4-session package in Ubuntu:
  Invalid
Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  ** this appears to be that the display is blanked/asleep at greeter & login.
  Forcing or waiting for screen to blank/sleep then waking up restores display
  See comments 8 & 10 for further info, demonstrations **

  Please note that this bug is being filed on a recent 15.10 Ubuntu
  image install but from a gnome session

  In a nutshell -
  Once nividia drivers are installed & used from nvidia-prime there is no longer a visible display in unity-greeter nor in an ubuntu session once logged in. (a blind log in successfully loads an ubuntu session.
  Everything in the ubuntu session works fine, there are no errors & all the related logs look ok, there is just no visible display.

  I can open apps, run commands, copy/create logs, play music, play
  videos, just no display so has to be done blindly from keyboard.

  On the other hand if I install gnome-shell & log in (blindly) to a
  gnome session from greeter then all is well & I get a visible
  display.

  The same behaviour is seen on an Xubuntu image install, once nvidia is
  installed & switched to, no visible display. Again there installing &
  logging into a gnome session works fine with visible display

  nvidia driver version doesn't matter, exact same is seen with current
  15.10 versions & the one I'm currently using (355) from drivers ppa.

  ** this appears to be that the display is blanked/asleep at greeter & login.
  Forcing or waiting for screen to blank/sleep then waking up restores display
  See comment 8 for further info **

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-core 2:1.17.2-1ubuntu7
  ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
  Uname: Linux 4.2.0-11-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Tue Sep 29 16:15:21 2015
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 4.2.0-11-generic, x86_64: installed
   nvidia-355, 355.11, 4.2.0-11-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: Lenovo Device [17aa:3801]
   NVIDIA Corporation GK107M [GeForce GT 755M] [10de:0fcd] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2015-09-28 (0 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150928)
  MachineType: LENOVO 20217
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-11-generic.efi.signed root=UUID=3712249e-a4c8-4b29-9ffb-f9f9e7d5259a ro quiet splash vt.handoff=7
  SourcePackage: xorg-server
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/18/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 74CN44WW(V3.05)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: VIQY0Y1
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y510P
  dmi.modalias: dmi:bvnLENOVO:bvr74CN44WW(V3.05):bd09/18/2013:svnLENOVO:pn20217:pvrLenovoIdeaPadY510P:rvnLENOVO:rnVIQY0Y1:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoIdeaPadY510P:
  dmi.product.name: 20217
  dmi.product.version: Lenovo IdeaPad Y510P
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+15.10.20150908-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.0-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Tue Sep 29 16:05:24 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 729
   vendor                                     LGD
  xserver.version: 2:1.17.2-1ubuntu7

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