[i915] X server lock up after resume from suspend, caught divided by zero error in i915 kernel driver

[Hiroshi Miura]

X server login screen sometimes freeze after resume from suspend state. It is occurred on Lenovo X201s with Ubuntu Oneiric 64bit 3.0.0-14 kernel with i915 driver.
I can find a divide by zero error in kernel when locked-up. please find attachments for log.

Its kernel error is happened at similar place in i915 driver with this driver patch.
http://permalink.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/6904

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-14-generic 3.0.0-14.23
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: miurahr 2107 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf2520000 irq 44'
   Mixer name : 'Intel IbexPeak HDMI'
   Components : 'HDA:14f15069,17aa2156,00100302 HDA:80862804,17aa21b5,00100000'
   Controls : 13
   Simple ctrls : 7
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6QHT31WW-1.12'
   Mixer name : 'ThinkPad EC 6QHT31WW-1.12'
   Components : ''
   Controls : 1
   Simple ctrls : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
CheckboxSubmission: 07ff79a84ecf3ad91dcc610453e380f0
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
Date: Tue Dec 27 07:41:13 2011
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=ad9740e6-22d5-4f8c-b70c-7ef33d3839cf
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007.1)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root 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 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 003: ID 147e:2016 Upek Biometric Touchchip/Touchstrip Fingerprint Sensor
MachineType: LENOVO 5129CTO
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-14-generic root=UUID=33ba92bf-0f1e-4436-ba33-eb9d689f7288 ro crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-14-generic N/A
 linux-backports-modules-3.0.0-14-generic N/A
 linux-firmware 1.60
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to oneiric on 2011-11-10 (46 days ago)
WifiSyslog:

dmi.bios.date: 12/17/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6QET62WW (1.32 )
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:bvr6QET62WW(1.32):bd12/17/2010:svnLENOVO:pn5129CTO:pvrThinkPadX201s:rvnLENOVO:rn5129CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 5129CTO
dmi.product.version: ThinkPad X201s
dmi.sys.vendor: LENOVO