WARNING: at /build/buildd/linux-2.6.38/block/genhd.c:1556 disk_clear_events 0x10a/0x120()

al conectar un ipod el sistema lanzo un mensaje de error

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.41
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 0/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: amaroe 1846 F.... pulseaudio
 /dev/snd/pcmC0D0p: amaroe 1846 F...m pulseaudio
CRDA: Error: [Errno 2] No existe el fichero o el directorio
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xa4000000 irq 16'
   Mixer name : 'Analog Devices AD1981'
   Components : 'HDA:11d41981,103c30c2,00100200 HDA:11c11040,103c1378,00100200'
   Controls : 11
   Simple ctrls : 9
Date: Fri Apr 8 09:31:10 2011
Failure: oops
Frequency: Once a day.
HibernationDevice: RESUME=/dev/sda5
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100406.1)
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=63b2f253-772a-4e58-8f6b-ef5290b55e92 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.49
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/block/genhd.c:1556 disk_clear_events+0x10a/0x120()
UpgradeStatus: Upgraded to natty on 2011-04-07 (1 days ago)
dmi.bios.date: 07/16/2007
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68YTT Ver. F.07
dmi.board.name: 30C2
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.28
dmi.chassis.asset.tag: CNU7200Q5C
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68YTTVer.F.07:bd07/16/2007:svnHewlett-Packard:pn:pvrF.07:rvnHewlett-Packard:rn30C2:rvrKBCVersion71.28:cvnHewlett-Packard:ct10:cvr:
dmi.product.version: F.07
dmi.sys.vendor: Hewlett-Packard