WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x2ea/0x360 [radeon]()

Input devices became unresponsive, screen flashed black a few times, did a hard reset.

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-6-generic-pae 2.6.38-6.34
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic-pae 2.6.38-rc7
Uname: Linux 2.6.38-6-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: deuce 1554 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf5e00000 irq 44'
   Mixer name : 'Realtek ALC269'
   Components : 'HDA:10ec0269,104d4600,00100004'
   Controls : 12
   Simple ctrls : 7
Card1.Amixer.info:
 Card hw:1 'Generic'/'HD-Audio Generic at 0xf0040000 irq 45'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,104d4600,00100200'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Fri Mar 11 12:03:29 2011
Failure: oops
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=689f5ad5-3602-4488-a787-bb94a9d9337f
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MachineType: Sony Corporation VPCEB3C5E
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-6-generic-pae root=UUID=5ea49c82-a867-470a-87f3-d50d22d572a6 ro i8042.nopnp quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-6-generic-pae N/A
 linux-backports-modules-2.6.38-6-generic-pae N/A
 linux-firmware 1.48
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x2ea/0x360 [radeon]()
UpgradeStatus: Upgraded to natty on 2011-02-26 (12 days ago)
dmi.bios.date: 10/06/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R1140Y8
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR1140Y8:bd10/06/2010:svnSonyCorporation:pnVPCEB3C5E:pvrC607F8BE:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VPCEB3C5E
dmi.product.version: C607F8BE
dmi.sys.vendor: Sony Corporation