Forwarding this bug from Ubuntu reporter Asier:
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/747100

[Problem]
Haven't seen many with PGTBL_ER: 0x00000003 but the IPEHR value looks mighty familiar.  This one is with pineviewgm.

[Original Description]
Thrown at the time to execute command "sudo apt-get autoremove && sudo apt-get autoclean" after updating

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: xserver-xorg-video-intel 2:2.14.0-4ubuntu4
ProcVersionSignature: Ubuntu 2.6.35-28.50-generic 2.6.35.11
Uname: Linux 2.6.35-28-generic i686
Architecture: i386
Chipset: IGDgm
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1024x600
 edid-base64: AP///////wAiZOkD+JQEABEUAQOAFg14CoYmlFdRkCchT1QAAAABAQEBAQEBAQEBAQEBAQEBlBEAsEBYGSA1I0UA3IEAAAAZFhQA2EBYJiBdIxUE3IEAAAAAAAAA/gAAAAAAAAAAAAAAAAAAAAAA/gAAAAAAAAAAAAEAAAAAADc=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes: 
 edid-base64:
Date: Fri Apr  1 11:12:32 2011
DistUpgraded: Log time: 2011-03-31 10:19:21.338233
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus:
 dkms.conf: Error! No 'BUILT_MODULE_NAME' directive specified for record #0.
 ndiswrapper, 1.56, 2.6.35-28-generic, i686: installed  (WARNING! Missing some built modules!)
 blcr, 0.8.2: added
DuplicateSignature: (ESR: 0x00000011 PGTBL_ER: 0x00000003 IPEHR: 0x01000000)
ExecutablePath: /usr/share/apport/apport-gpu-error-intel.py
GraphicsCard:
 Intel Corporation N10 Family Integrated Graphics Controller [8086:a011] (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:83ac]
   Subsystem: ASUSTeK Computer Inc. Device [1043:83ac]
InstallationMedia: Ubuntu-Netbook 10.10 "Maverick Meerkat" - Release Candidate i386 (20100928.2)
InterpreterPath: /usr/bin/python2.7
MachineType: ASUSTeK Computer INC. 1001PX
ProcCmdline: /usr/bin/python /usr/share/apport/apport-gpu-error-intel.py
ProcEnviron:
 
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-28-generic root=UUID=30f906ac-077b-42cb-a9b1-4ef539f13160 ro quiet splash acpi_osi=Linux vt.handoff=7
ProcKernelCmdLine_: BOOT_IMAGE=/boot/vmlinuz-2.6.35-28-generic root=UUID=30f906ac-077b-42cb-a9b1-4ef539f13160 ro quiet splash acpi_osi=Linux vt.handoff=7
RelatedPackageVersions:
 xserver-xorg             1:7.6~3ubuntu11
 libdrm2                  2.4.23-1ubuntu5
 xserver-xorg-video-intel 2:2.14.0-4ubuntu4
Renderer: Unknown
SourcePackage: xserver-xorg-video-intel
Title: [IGDgm] GPU lockup (ESR: 0x00000011 PGTBL_ER: 0x00000003 IPEHR: 0x01000000)
UpgradeStatus: Upgraded to natty on 2011-03-31 (0 days ago)
UserGroups:
 
dmi.bios.date: 04/30/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0601
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 1001PX
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0601:bd04/30/2010:svnASUSTeKComputerINC.:pn1001PX:pvrx.x:rvnASUSTeKComputerINC.:rn1001PX:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x:
dmi.product.name: 1001PX
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.
version.compiz: compiz 1:0.9.4git20110322-0ubuntu5
version.libdrm2: libdrm2 2.4.23-1ubuntu5
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu6