[Lucid Beta2] Booting with new ubiquity live session audio doesn't work

Binary package hint: ubiquity

ISO Testing, Lucid Beta2. 7 April 2010.
Hardware: Dell Inspiron 1520

Booting with Live Image, if you don't press anything on the first screen and wait for Ubiquity to load, and then you press "Try Ubuntu" Audio doesn't works.

If you press a key in the first screen falling back to old menu, you select "Try Ubuntu without change your computer" audio works out-of-the-box.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: ubiquity 2.2.15
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Uname: Linux 2.6.32-19-generic i686
Architecture: i386
Date: Wed Apr 7 14:23:56 2010
LiveMediaBuild: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100406.1)
ProcEnviron:
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
---
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: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D1', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/seq', '/dev/snd/timer', '/dev/sequencer2', '/dev/sequencer'] failed with exit code 1:
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 21'
   Mixer name : 'SigmaTel STAC9205'
   Components : 'HDA:838476a0,102801f1,00100204 HDA:14f12c06,14f1000f,00100000'
   Controls : 19
   Simple ctrls : 11
DistroRelease: Ubuntu 10.04
LiveMediaBuild: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100406.1)
Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14
PackageArchitecture: i386
ProcEnviron:
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Tags: lucid
Uname: Linux 2.6.32-19-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 11/05/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0KY768
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd11/05/2007:svnDellInc.:pnInspiron1520:pvr:rvnDellInc.:rn0KY768:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1520
dmi.sys.vendor: Dell Inc.

---
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: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D1', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/seq', '/dev/snd/timer', '/dev/sequencer2', '/dev/sequencer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 21'
   Mixer name : 'SigmaTel STAC9205'
   Components : 'HDA:838476a0,102801f1,00100204 HDA:14f12c06,14f1000f,00100000'
   Controls : 19
   Simple ctrls : 11
DistroRelease: Ubuntu 10.04
LiveMediaBuild: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100406.1)
MachineType: Dell Inc. Inspiron 1520
Package: linux (not installed)
ProcCmdLine: BOOT_IMAGE=/casper/vmlinuz noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
ProcEnviron:
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Regression: Yes
RelatedPackageVersions: linux-firmware 1.33
Reproducible: Yes
Tags: lucid kconfig regression-potential needs-upstream-testing
Uname: Linux 2.6.32-19-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 11/05/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0KY768
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd11/05/2007:svnDellInc.:pnInspiron1520:pvr:rvnDellInc.:rn0KY768:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1520
dmi.sys.vendor: Dell Inc.