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In the dmesg log a bunch of MTRR related errors are reported:

[    0.000000] *BAD*gran_size: 64K 	chunk_size: 32M 	num_reg: 10  	lose cover RAM: -16M
[    0.000000] *BAD*gran_size: 64K 	chunk_size: 64M 	num_reg: 10  	lose cover RAM: -16M
[    0.000000] mtrr_cleanup: can not find optimal value
[    0.000000] please specify mtrr_gran_size/mtrr_chunk_size

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-48.74-generic 3.2.46
Uname: Linux 3.2.0-48-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.0.1-0ubuntu17.3
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,regex,resize,animation,workarounds,move,gnomecompat,imgpng,mousepoll,grid,snap,wall,place,vpswitch,unitymtgrabhandles,expo,session,ezoom,staticswitcher,fade,scale,unityshell]
CompositorRunning: compiz
Date: Sun Jun 30 10:55:13 2013
DistUpgraded: 2012-04-27 04:49:48,715 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
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:21ce]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: LENOVO 4177CTO
MarkForUpload: True
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_US.UTF-8
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-48-generic root=UUID=478a278b-dcf5-4f8b-8e3a-3d04f592c44a ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to precise on 2012-04-27 (429 days ago)
dmi.bios.date: 05/17/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 83ET57WW (1.27 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4177CTO
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:bvr83ET57WW(1.27):bd05/17/2011:svnLENOVO:pn4177CTO:pvrThinkPadT420:rvnLENOVO:rn4177CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4177CTO
dmi.product.version: ThinkPad T420
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.7.12-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.39-0ubuntu0.2
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.4-0ubuntu0.6
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.4-0ubuntu0.6
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.13
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4.4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build3

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug compiz-0.9 precise running-unity ubuntu
-- 
MTRR value incorrect
https://bugs.launchpad.net/bugs/1196262
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