Public bug reported:

System using Xen kernel boots up all the way until after the startup log
says "Starting LightDM [OK]." Then the screen goes black and is
unresponsive.

Using the normal kernel 3.19 works fine.

Using proprietary Nvidia drivers.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4
Uname: Linux 3.19.0-26-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  346.59  Tue Mar 31 14:10:31 
PDT 2015
 GCC version:  gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
ApportVersion: 2.17.2-0ubuntu1.3
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Sep  2 19:52:41 2015
DistUpgraded: 2015-09-01 20:33:24,490 DEBUG enabling apt cron job
DistroCodename: vivid
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.19.0-26-generic, x86_64: installed
 nvidia-346, 346.59, 3.19.0-26-generic, x86_64: installed
GraphicsCard:
 NVIDIA Corporation GF114 [GeForce GTX 560 Ti] [10de:1200] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: NVIDIA Corporation Device [10de:0898]
 NVIDIA Corporation GF114 [GeForce GTX 560 Ti] [10de:1200] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: NVIDIA Corporation Device [10de:0898]
InstallationDate: Installed on 2015-09-01 (1 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: MSI MS-7673
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-26-generic 
root=/dev/mapper/ubuntu--vg-root ro
SourcePackage: xorg
UpgradeStatus: Upgraded to vivid on 2015-09-02 (0 days ago)
dmi.bios.date: 08/01/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V1.19
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P67A-G45 (MS-7673)
dmi.board.vendor: MSI
dmi.board.version: 2.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 2.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV1.19:bd08/01/2012:svnMSI:pnMS-7673:pvr2.0:rvnMSI:rnP67A-G45(MS-7673):rvr2.0:cvnMSI:ct3:cvr2.0:
dmi.product.name: MS-7673
dmi.product.version: 2.0
dmi.sys.vendor: MSI
version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.9-2ubuntu1~vivid2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.9-2ubuntu1~vivid2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917-1~exp1ubuntu2.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.11-1ubuntu2build1
xserver.bootTime: Wed Sep  2 19:36:39 2015
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.17.1-0ubuntu3

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


** Tags: amd64 apport-bug ubuntu vivid

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1491685

Title:
  Xen/Xorg blank screen [vivid]

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