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[Ben Williams <bp.williams0@xxxxxxxxx>]

*** This bug is a duplicate of bug 1302264 ***
    https://bugs.launchpad.net/bugs/1302264

I have the same problem, also on a relatively new thinkpad, in my case the X1 carbon.
I know this is reported as a duplicate of #1302264 but the problems encountered here seem distinct from those reported for that bug

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https://bugs.launchpad.net/bugs/1302302

Title:
  [regression] Unity now only starts in software rendering mode (i965
  Mesa driver can't load)

Status in Compiz:
  New
Status in Unity:
  New
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  After updating today Unity only starts in software rendering mode. I can tell because:
    1. There's no dash blur.
    2. Graphics performance is slow.
    3. .xsession-errors says:
         libGL error: failed to open drm device: Permission denied
         libGL error: failed to load driver: i965
    4. compiz is linked to the software driver:

  $ pmap `pidof compiz` | grep dri
  00007f9a1e386000   3256K r-x-- swrast_dri.so
  00007f9a1e6b4000   2048K ----- swrast_dri.so
  00007f9a1e8b4000     60K r---- swrast_dri.so
  00007f9a1e8c3000     32K rw--- swrast_dri.so

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.0+14.04.20140403-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-22.44-generic 3.13.8
  Uname: Linux 3.13.0-22-generic x86_64
  .tmp.unity.support.test.1:
   
  ApportVersion: 2.14-0ubuntu1
  Architecture: amd64
  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 Apr  4 10:46:53 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:220c]
  InstallationDate: Installed on 2014-04-03 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140331)
  MachineType: LENOVO 20AQCTO1WW
  ProcEnviron:
   LANGUAGE=en_AU:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-22-generic.efi.signed root=UUID=a759a4aa-6f67-434e-8f5a-eae13c810c59 ro acpi_backlight=vendor quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/10/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET67WW (2.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 PRO
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGJET67WW(2.17):bd12/10/2013:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98401PRO:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11+14.04.20140328-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu1
  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: Fri Apr  4 10:46:12 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1034 
   vendor                                     LGD
  xserver.version: 2:1.15.0-1ubuntu7

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