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[Launchpad Bug Tracker <1501041@xxxxxxxxxxxxxxxxxx>]

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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.

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

** Affects: nvidia-graphics-drivers (Ubuntu)
     Importance: Critical
         Status: Confirmed


** Tags: amd64 apport-bug ubuntu wily
-- 
No visible display in ubuntu session when using nvidia drivers via nvidia-prime
https://bugs.launchpad.net/bugs/1501041
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