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[professordes <1434396@xxxxxxxxxxxxxxxxxx>]

Same deal with a Thinkpad X201 - this also now boots to the lightdm
login screen after the latest updates but it "freezes" at this point.
The cursor disappears when it is moved and the only thing that
resurrects the laptop after this is the power button.

Again:

upstart+lightdm
systemd+gdm

are both working OK on this laptop too.

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https://bugs.launchpad.net/bugs/1434396

Title:
  Xserver does not start on boot (low-graphics mode)

Status in Light Display Manager:
  Confirmed
Status in lightdm package in Ubuntu:
  Triaged

Bug description:
  After upgrading to (32bit) vivid I hadn't got any problem, but since a
  day (daily upgraded) booting results in a dialog saying low graphics
  mode and a dialog window about this. Choosing running in default mode
  causes to boot splash to be shown forever. if I choose exit to
  console, log in then service stop then start for lightdm, it works
  then though. Maybe is not Xserver bug, but the new init system
  (systemd) race condition of starting things, or such?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xserver-xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  Uname: Linux 3.19.0-9-generic i686
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.16.2-0ubuntu3
  Architecture: i386
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Fri Mar 20 07:35:37 2015
  DistUpgraded: 2014-10-24 18:45:04,038 DEBUG enabling apt cron job
  DistroCodename: vivid
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 4.3.26, 3.19.0-9-generic, i686: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:21dd]
  InstallationDate: Installed on 2012-03-03 (1111 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  MachineType: LENOVO 5016NW6
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-9-generic root=UUID=8df578aa-47e3-483f-b694-bf7effd24b7d ro i915.semaphores=0 quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to vivid on 2014-10-24 (146 days ago)
  dmi.bios.date: 11/04/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8GET38WW (1.15 )
  dmi.board.name: 5016NW6
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8GET38WW(1.15):bd11/04/2011:svnLENOVO:pn5016NW6:pvrThinkPadL520:rvnLENOVO:rn5016NW6:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 5016NW6
  dmi.product.version: ThinkPad L520
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.1+15.04.20150303-0ubuntu1
  version.libdrm2: libdrm2 2.4.59-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.0-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.0-0ubuntu1
  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~exp1ubuntu2build1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Fri Mar 20 07:25:51 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                9196 
   vendor                                     AUO
  xserver.version: 2:1.17.1-0ubuntu3

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