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[pdf <1501041@xxxxxxxxxxxxxxxxxx>]

I believe this may be a kernel regression.  I can repro on 15.04 with
sddm by installing any 4.x series kernel, haven't done any bisecting,
and can't find anything interesting in dmesg (when I can switch to a vc
sucessfully after X starts but fails to output anything), but with a
single change from 3.19 to any of the mainline PPA 4.x kernels, the
problem is immediately evident, and occasinally CPU locks up (SKL), but
only when both GPUs are enabled (I have a BIOS hardware mux that I can
use to force Nvidia only, which is what I'm doing currently to have a
usable system and avoid recompiling iwl 8260 drivers for 3.19 every
kernel update).

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Packages, which is subscribed to nvidia-graphics-drivers in Ubuntu.
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 Light Display Manager:
  Confirmed
Status in lightdm package in Ubuntu:
  Triaged
Status in nvidia-graphics-drivers package in Ubuntu:
  Invalid
Status in ubuntu-drivers-common package in Ubuntu:
  Triaged
Status in unity-greeter package in Ubuntu:
  Invalid
Status in xfce4-session package in Ubuntu:
  Invalid
Status in xorg-server package in Ubuntu:
  Incomplete

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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