Problem seems to be related to the fact that I suspended my laptop while it was docked and attached to an external monitor (displayport attached to output DP3), and then undocked and resumed with the monitor disconnected.
(By the way, in case it matters, with this laptop and the precise kernel, I found I had to boot with "intel_iommu=igfx_off" or else I see a bunch of messages like
[ 98.467011] DRHD: handling fault status reg 2
[ 98.467014] DMAR:[DMA Write] Request device [00:02.0] fault addr 400020000
[ 98.467038] DMAR:[fault reason 05] PTE Write access is not set
where 02.0 is the graphics device; so this report is running with igfx_off and hence a not-totally-default precise install)
ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: xserver-xorg-video-intel 2:2.15.901-1ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-7.13-generic 3.2.0-rc7
Uname: Linux 3.2.0-7-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 1.90-0ubuntu1
Architecture: amd64
Chipset: arrandale
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
Date: Wed Jan 4 21:42:39 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DuplicateSignature: [arrandale] GPU lockup render.IPEHR: 0x01840000 Ubuntu 12.04
ExecutablePath: /usr/share/apport/apport-gpu-error-intel.py
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GpuHangFrequency: I don't know
GpuHangReproducibility: I don't know
GpuHangStarted: I don't know
GraphicsCard:
Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:21c1]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120104)
InterpreterPath: /usr/bin/python2.7
MachineType: LENOVO 2901CTO
ProcCmdline: /usr/bin/python /usr/share/apport/apport-gpu-error-intel.py
ProcEnviron:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-7-generic root=UUID=677292b2-a7ba-4d9e-8f1a-662c546b62ce ro intel_iommu=igfx_off quiet splash vt.handoff=7
RelatedPackageVersions:
xserver-xorg 1:7.6+7ubuntu7
libdrm2 2.4.29-1ubuntu1
xserver-xorg-video-intel 2:2.15.901-1ubuntu4
SourcePackage: xserver-xorg-video-intel
Title: [arrandale] GPU lockup render.IPEHR: 0x01840000
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
dmi.bios.date: 10/27/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6UET61WW (1.41 )
dmi.board.name: 2901CTO
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:bvr6UET61WW(1.41):bd10/27/2010:svnLENOVO:pn2901CTO:pvrThinkPadT410s:rvnLENOVO:rn2901CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2901CTO
dmi.product.version: ThinkPad T410s
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu8
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.29-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.10.4-1ubuntu6
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 2:2.15.901-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1
Could you switch on kernel modesetting debug messages? Run 'sudo xdiagnose', it's the first checkbox. Click apply, let it rebuild your bootloader, then reboot. Now reproduce the bug, and then collect 'sudo dmesg > dmesg.txt' and post that here.