30 seconds sound lag after upgrade to Ubuntu 10.04

After upgrading to Ubuntu 10.04 I get a sound lag of about 30 seconds in the game Enemy Territory Quake Wars.

At first, the sound works as expected. But after some time (about 30-60 seconds) the game gets totally quiet.
Another 30 seconds later, the sound returns, but now playing with a delay of 30 seconds.

There are no relevant messages to the games log or the syslog.

This could be an alsa or pulse audio bug.

Running the game with pasuspender causes excessive processor usage and logs messages like:

idAudioHardwareALSA::Write: 4096 frames overflowed and dropped
snd_pcm_readi failed: Resource temporarily unavailable
snd_pcm_readi failed: Resource temporarily unavailable
snd_pcm_readi failed: Resource temporarily unavailable
...

Are there any changes in 10.04 that could have affected sound latency?

alsa-source:
  Installerad: (ingen)
  Kandidat: 1.0.22.1+dfsg-0ubuntu3
  Versionstabell:
     1.0.22.1+dfsg-0ubuntu3 0
        500 http://se.archive.ubuntu.com/ubuntu/ lucid/universe Packages

pulseaudio:
  Installerad: 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14
  Kandidat: 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14
  Versionstabell:
 *** 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14 0
        500 http://se.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

linux:
  Installerad: (ingen)
  Kandidat: 2.6.32.21.22
  Versionstabell:
     2.6.32.21.22 0
        500 http://se.archive.ubuntu.com/ubuntu/ lucid/main Packages

00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
 Subsystem: ASUSTeK Computer Inc. Device 817f
 Flags: bus master, fast devsel, latency 0, IRQ 19
 Memory at bdcf8000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: [50] Power Management version 2
 Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
 Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
 Capabilities: [100] Virtual Channel <?>
 Capabilities: [130] Root Complex Link <?>
 Kernel driver in use: HDA Intel
 Kernel modules: snd-hda-intel
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jens 2152 F.... pulseaudio
CRDA: Error: [Errno 2] Filen eller katalogen finns inte
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xbdcf8000 irq 19'
   Mixer name : 'Analog Devices AD1986A'
   Components : 'HDA:11d41986,1043818f,00100500'
   Controls : 38
   Simple ctrls : 22
DistroRelease: Ubuntu 10.04
HibernationDevice: RESUME=UUID=d3545550-043b-4ca2-9b8f-ca814d66b113
MachineType: stem manufacturer System Product Name
Package: linux (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic root=UUID=637d8b8e-9cf4-4ad8-b482-c5175b466220 ro quiet splash
ProcEnviron:
 LANG=sv_SE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Regression: Yes
RelatedPackageVersions: linux-firmware 1.34
Reproducible: Yes
RfKill:

Tags: lucid ubuntu-une audio regression-release needs-upstream-testing
Uname: Linux 2.6.32-21-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 01/23/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0802
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5LD2-SE
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev x.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0802:bd01/23/2007:svnstemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5LD2-SE:rvrRevx.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: stem manufacturer