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[M4he <1302270@xxxxxxxxxxxxxxxxxx>]

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

This suddenly appeared for me as well.
I've been using compton's opengl backend for compositing and after booting up today I got the same libGL permission errors and tearing on the desktop (due to the software rendering mode fallback I assume). Then I noticed my user was not in the 'video' group.
I did a "sudo usermod -a -G video <username>" and rebooted. That fixed the issue for me.

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https://bugs.launchpad.net/bugs/1302270

Title:
  [regression] Poor performance with recent update with i965: libGL
  error: failed to open drm device: Permission denied

Status in Compiz:
  Confirmed
Status in Unity:
  Confirmed
Status in “systemd” package in Ubuntu:
  Confirmed
Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  I rebooted into up to date trusty and noticed Unity was incredibly
  slow. I hadn't rebooted in a while, so I'm not sure what package
  caused the issue, though I'm guessing it is mesa (I saw i965 pci ids
  were ifdef'd in the Launchpad diff, but I didn't look super closely).

  ~/.xsession-errors has this to say:
  libGL error: failed to open drm device: Permission denied
  libGL error: failed to load driver: i965

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  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: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Thu Apr  3 20:08:18 2014
  DistUpgraded: 2013-11-04 08:48:34,282 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:215a]
  InstallationDate: Installed on 2011-06-28 (1010 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110425.2)
  Lsusb:
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching 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 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 5129CTO
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-22-generic root=UUID=88689ad2-74b5-442c-9290-8ae60b63e16b ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to trusty on 2013-11-04 (150 days ago)
  dmi.bios.date: 02/24/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET64WW (1.34 )
  dmi.board.name: 5129CTO
  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:bvr6QET64WW(1.34):bd02/24/2011:svnLENOVO:pn5129CTO:pvrThinkPadX201s:rvnLENOVO:rn5129CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 5129CTO
  dmi.product.version: ThinkPad X201s
  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: Thu Apr  3 19:38:17 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16404 
   vendor                                     LEN
  xserver.version: 2:1.15.0-1ubuntu7

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