WARNING: at /build/buildd/linux-2.6.38/lib/kref.c:34 kref_get 0x2d/0x30()

This is probably the reason the audio device starts up "muted".
Unmuting the audio device and playing audio works fine.

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: lhw 1639 F.... pulseaudio
CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd4720000 irq 44'
   Mixer name : 'Intel IbexPeak HDMI'
   Components : 'HDA:111d7603,103c7008,00100202 HDA:11c11040,103c3066,00100200 HDA:80862804,80860101,00100000'
   Controls : 23
   Simple ctrls : 14
Date: Mon Apr 18 08:14:05 2011
Failure: oops
Frequency: Once a day.
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
MachineType: Hewlett-Packard HP EliteBook 2540p
PccardctlIdent:
 Socket 0:
   product info: "RICOH", "Bay8Controller", "", ""
   manfid: 0x0000, 0x0000
   function: 254 (unknown)
PccardctlStatus:
 Socket 0:
   3.3V 16-bit PC Card
   Subdevice 0 (function 0) bound to driver "pata_pcmcia"
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-8-generic root=UUID=6b7589a2-6858-447f-ad80-8bb1214dee2c 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 1.50
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/lib/kref.c:34 kref_get+0x2d/0x30()
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/24/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68CSU Ver. F.08
dmi.board.name: 7008
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 38.32
dmi.chassis.asset.tag: CZC02394MR
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68CSUVer.F.08:bd11/24/2010:svnHewlett-Packard:pnHPEliteBook2540p:pvr:rvnHewlett-Packard:rn7008:rvrKBCVersion38.32:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 2540p
dmi.sys.vendor: Hewlett-Packard