I can confirm the modification of alsa-base.conf fixed this issue.
Linux vincent-laptop 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19
UTC 2010 i686 GNU/Linux
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04 LTS"
00:14.2 Audio device: ATI Technologies Inc IXP SB4x0 High Definition Audio
Controller (rev 01)
Subsystem: Packard Bell B.V. Device c101
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 64, Cache Line Size: 32 bytes
Interrupt: pin ? routed to IRQ 16
Region 0: Memory at c0400000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
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ATI IXP SB4x0 HDA: headphones don't work but they do mute speakers
https://bugs.launchpad.net/bugs/215586
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