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[Sam_ <864374@xxxxxxxxxxxxxxxxxx>]

Apparently still a bug then. Possibly dupe of Bug #816646

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https://bugs.launchpad.net/bugs/864374

Title:
  Lightdm fails to start ("no screens found") but gdm works fine

Status in “lightdm” package in Ubuntu:
  Invalid

Bug description:
  This is on an 18-month old Thinkpad T410 with a long history of minor
  workarounds to fix hardware compatibility bugs; upgrading from
  maverick to oneiric with a very brief stopover in natty.  In order to
  get an x session to load I had to switch from lightdm back to gdm.
  There's no xorg.conf anymore (!!) so I don't know where to look, or
  what to alter, to fix the problem.  The x-0.log, which I don't think
  is attached,  reads:

  (==) Using system config directory "/usr/share/X11/xorg.conf.d"
  (EE) intel(0): [drm] failed to set drm interface version.
  (EE) intel(0): Failed to become DRM master.
  DRM_IOCTL_I915_GEM_APERTURE failed: Bad file descriptor
  Assuming 131072kB available aperture size.
  May lead to reduced performance or incorrect rendering.
  get chip id failed: -1 [9]
  param: 4, val: 0
  (EE) intel(0): failed to get resources: Bad file descriptor
  (EE) Screen(s) found, but none have a usable configuration.

  Fatal server error:
  no screens found

  Happy to install debug packages, etc., if need be but I imagine this is just a config issue.  Thanks,
  Matt

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: xorg 1:7.6+7ubuntu7
  ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.23-0ubuntu2
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,regex,mousepoll,resize,move,grid,wall,gnomecompat,place,imgpng,vpswitch,snap,animation,expo,fade,session,workarounds,ezoom,unitymtgrabhandles,scale,unityshell]
  CompositorRunning: compiz
  Date: Sat Oct  1 18:48:48 2011
  DistUpgraded: Log time: 2011-09-30 21:27:04.569561
  DistroCodename: oneiric
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:215a]
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 003: ID 17ef:480f Lenovo Integrated Webcam [R5U877]
  MachineType: LENOVO 2516CTO
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=08517b2d-d32a-45d4-b574-a6d38f0dde9c ro crashkernel=384M-2G:64M,2G-:128M splash resume=UUID=c4088466-c2c4-4da0-821b-530b369d1fb8 vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg crash
  UdevDb: Error: [Errno 2] No such file or directory
  UpgradeStatus: Upgraded to oneiric on 2011-10-01 (0 days ago)
  dmi.bios.date: 06/07/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6IET65WW (1.25 )
  dmi.board.name: 2516CTO
  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:bvr6IET65WW(1.25):bd06/07/2010:svnLENOVO:pn2516CTO:pvrThinkPadT410:rvnLENOVO:rn2516CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2516CTO
  dmi.product.version: ThinkPad T410
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu25
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

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