[9.10 regression] HDA power_save=10

This is on a HP Mini 1000 (1120NR).
Using Ubuntu UNR Karmic alpha-3 (also tried normal karmic alpha-4) iso.

Generally the sound works good. The problem appears after a sound has been played when there is only silence, after a few seconds I hear a crackling noise which lasts for a few milliseconds. It happens everytime. Maybe like a powersaving problem?

To test it, I just do:
paplay /usr/share/sounds/question.wav
I wait a few seconds and then I hear the crackling noise.

Note also that in at boot-time, I think when loading the hda-intel module, there is also a crackling sound and at shutdown too.
Under Jaunty, the sound didn't work but using alsa-source and compiling the modules I could make it work, there were no crackling sound except at boot time and shutdown.
I remember when I was using HP MIE (Ubuntu for HP Mini's), they used a workaround to avoid that noise, they mute the volume at boot-time and at shutdown (but I'm not certain).

I'm available to answer any questions. Note that I'm using the LiveCD so this is not currently installed on my laptop.

My alsa info (it also made a noise when doing alsa-info.sh):
http://www.alsa-project.org/db/?f=280ad492b833cc8d5f9972a02a6a63bb20746322

My sound card is:

00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
        Subsystem: Hewlett-Packard Company Device 361a
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at fe938000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

ProblemType: Bug
Architecture: i386
Date: Sat Jul 25 13:35:17 2009
DistroRelease: Ubuntu 9.10
LiveMediaBuild: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Alpha i386 (20090723)
MachineType: Hewlett-Packard HP Mini
Package: linux-image-2.6.31-3-generic 2.6.31-3.19
ProcCmdLine: BOOT_IMAGE=/casper/vmlinuz noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/netbook-remix.seed boot=casper initrd=/casper/initrd.lz quiet splash --
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-3.19-generic
RelatedPackageVersions: linux-backports-modules-2.6.31-3-generic N/A
SourcePackage: linux
Tags: ubuntu-unr
Uname: Linux 2.6.31-3-generic i686
dmi.bios.date: 11/07/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 361A0 Ver. F.05
dmi.board.name: 361A
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 02.0D
dmi.chassis.asset.tag: CNU9021486
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr361A0Ver.F.05:bd11/07/2008:svnHewlett-Packard:pnHPMini:pvrF.05:rvnHewlett-Packard:rn361A:rvrKBCVersion02.0D:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Mini
dmi.product.version: F.05
dmi.sys.vendor: Hewlett-Packard