This issue is more or less identical to https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/321605. The main difference is my laptop being a HP Pavilion dv5-1214eo.
In short: Unless "options snd-hda-intel model=hp-dv5" is added to /etc/modprobe.d/alsa-base.conf (+ system restarted), the speakers are broken and produce no sound at all. With the line, the speakers work.
I'm filing this issue as a new bug per Daniel T Chen's instructions in the above mentioned bug report.
ProblemType: Bug
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: SB [HDA ATI SB], 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: zero3 2232 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'SB'/'HDA ATI SB at 0xd2400000 irq 16'
Mixer name : 'IDT 92HD71B7X'
Components : 'HDA:111d76b2,103c3622,00100302'
Controls : 35
Simple ctrls : 22
Card1.Amixer.info:
Card hw:1 'HDMI'/'HDA ATI HDMI at 0xd2310000 irq 19'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100000'
Controls : 4
Simple ctrls : 1
Card1.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Date: Mon Oct 12 20:06:29 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: fglrx
Package: alsa-base 1.0.20+dfsg-1ubuntu5
PackageArchitecture: all
ProcEnviron:
LANG=da_DK.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-13.44-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.31-13-generic x86_64
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