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[LGB [Gábor Lénárt] <spam@xxxxxx>]

It seems though it can be guessed more or less what can cause problems
(ie thinkpad + lightdm + systemd) the exact details are not the same,
and some other conditions can/do count as well. Also the "not always"
factor sometimes, kinda odd.

However, as bug 1340964 if often referenced for me, and it is about some
kind of VT activation problem, can it be because some race condition on
using VTs or such? Since systemd may do deeper parallelism on the boot
process than upstart (I am not sure just guessing) or at least it did it
not the very same way, it can explain why it works with upstart but not
with systemd.

But really, I am just guessing, and trying to give hints, as release
data for vivid is coming and this bug still exists rendering ubuntu
totally unusable for normal users on some hardware like some thinkpad
notebooks which are not so rare, I think.

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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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