Public bug reported:

Version: Ubuntu Gnome 14.04, trusty
Laptop: Asus U36JC

I am currently using gdm version from "ppa:darkxst/gdm-prime" which fixes the 
bug #1288572. This gdm version should be released soon.
If there is only one display (the built-in laptop monitor), gdm works fine 
without any problems. If I plugged in another VGA display at boot time, gdm 
will flicker between grey and black (off) background without showing any text 
and buttons etc... gdm becomes useless at this state. 

Workaround: Login to gnome-shell with one display first. and then
plugged in the second VGA monitor. gnome-shell works fine with multiple
monitors.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-19.39-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.38  Wed Jan  8 19:32:30 
PST 2014
 GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-17ubuntu1)
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Wed Mar 26 13:37:57 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.13.0-18-generic, x86_64: installed
 bbswitch, 0.7, 3.13.0-19-generic, x86_64: installed
 nvidia-331, 331.38, 3.13.0-18-generic, x86_64: installed
 nvidia-331, 331.38, 3.13.0-19-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 18) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:1542]
 NVIDIA Corporation GT218M [GeForce 310M] [10de:0a70] (rev a2) (prog-if 00 [VGA 
controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:1542]
InstallationDate: Installed on 2014-03-04 (21 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
MachineType: ASUSTeK Computer Inc. U36JC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-19-generic 
root=UUID=0d039a7c-cdff-4d22-9604-569584977a76 ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/26/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: U36JC.205
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: U36JC
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.:bvrU36JC.205:bd01/26/2011:svnASUSTeKComputerInc.:pnU36JC:pvr1.0:rvnASUSTeKComputerInc.:rnU36JC:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: U36JC
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Wed Mar 26 10:29:34 2014
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 Error loading keymap 
/var/lib/xkb/server-992DCD2811F9928D990F91F3229E52A1EC62B72A.xkm
 Error loading keymap 
/var/lib/xkb/server-992DCD2811F9928D990F91F3229E52A1EC62B72A.xkm
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.0-1ubuntu7

** Affects: ubuntu-gnome
     Importance: Undecided
         Status: New

** Affects: gdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty ubuntu

** Package changed: xorg (Ubuntu) => gdm (Ubuntu)

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https://bugs.launchpad.net/bugs/1297630

Title:
  GDM does not work in multiple displays in nvidia driver (nvidia-331)
  (trusty) (optimus laptop)

Status in Ubuntu GNOME:
  New
Status in “gdm” package in Ubuntu:
  New

Bug description:
  Version: Ubuntu Gnome 14.04, trusty
  Laptop: Asus U36JC

  I am currently using gdm version from "ppa:darkxst/gdm-prime" which fixes the 
bug #1288572. This gdm version should be released soon.
  If there is only one display (the built-in laptop monitor), gdm works fine 
without any problems. If I plugged in another VGA display at boot time, gdm 
will flicker between grey and black (off) background without showing any text 
and buttons etc... gdm becomes useless at this state. 

  Workaround: Login to gnome-shell with one display first. and then
  plugged in the second VGA monitor. gnome-shell works fine with
  multiple monitors.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-19.39-generic 3.13.6
  Uname: Linux 3.13.0-19-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.38  Wed Jan  8 19:32:30 
PST 2014
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-17ubuntu1)
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Wed Mar 26 13:37:57 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.13.0-18-generic, x86_64: installed
   bbswitch, 0.7, 3.13.0-19-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-18-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-19-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: No
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 18) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1542]
   NVIDIA Corporation GT218M [GeForce 310M] [10de:0a70] (rev a2) (prog-if 00 
[VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1542]
  InstallationDate: Installed on 2014-03-04 (21 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
  MachineType: ASUSTeK Computer Inc. U36JC
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-19-generic 
root=UUID=0d039a7c-cdff-4d22-9604-569584977a76 ro quiet splash
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/26/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: U36JC.205
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: U36JC
  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.:bvrU36JC.205:bd01/26/2011:svnASUSTeKComputerInc.:pnU36JC:pvr1.0:rvnASUSTeKComputerInc.:rnU36JC:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: U36JC
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10-1ubuntu2
  xserver.bootTime: Wed Mar 26 10:29:34 2014
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   Error loading keymap 
/var/lib/xkb/server-992DCD2811F9928D990F91F3229E52A1EC62B72A.xkm
   Error loading keymap 
/var/lib/xkb/server-992DCD2811F9928D990F91F3229E52A1EC62B72A.xkm
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.0-1ubuntu7

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