thinkpad_acpi: WARNING: Outdated ThinkPad BIOS/EC firmware

ubuntu 11.04
kernel panic at startup

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.39
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic 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
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: paolo 1342 F.... pulseaudio
CRDA: Error: [Errno 2] File o directory non esistente
Card0.Amixer.info:
 Card hw:0 'ICH6'/'Intel ICH6 with AD1981B at irq 22'
   Mixer name : 'Analog Devices AD1981B'
   Components : 'AC97a:41445374'
   Controls : 26
   Simple ctrls : 18
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 1YHT29WW-1.06'
   Mixer name : 'ThinkPad EC 1YHT29WW-1.06'
   Components : ''
   Controls : 2
   Simple ctrls : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
   Playback channels: Mono
   Limits: Playback 0 - 14
   Mono: Playback 12 [86%] [on]
Date: Mon Mar 28 19:35:02 2011
Failure: oops
HibernationDevice: RESUME=UUID=a3126cab-9c66-414d-9ccf-9b0215ae0ee3
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110302)
Lsusb:
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: IBM 2668R1G
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic root=UUID=afd0ffc5-b775-4e28-a744-df8e8a14d88d ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-7-generic N/A
 linux-backports-modules-2.6.38-7-generic N/A
 linux-firmware 1.49
SourcePackage: linux
Title: thinkpad_acpi: WARNING: Outdated ThinkPad BIOS/EC firmware
UpgradeStatus: Upgraded to natty on 2011-03-25 (2 days ago)
dmi.bios.date: 05/18/2006
dmi.bios.vendor: IBM
dmi.bios.version: 1YET62WW (1.27 )
dmi.board.name: 2668R1G
dmi.board.vendor: IBM
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: IBM
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnIBM:bvr1YET62WW(1.27):bd05/18/2006:svnIBM:pn2668R1G:pvrThinkPadT43:rvnIBM:rn2668R1G:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable:
dmi.product.name: 2668R1G
dmi.product.version: ThinkPad T43
dmi.sys.vendor: IBM