slmodemd process hogging access to /dev/snd devices -> Sound Preferences -> Output tab -> "Dummy Output: Stereo" - Codec + Mixer: Realtek ALC268 - ALC268 Analog (DUPLEX) Audio device [0403]: ATI Technologies Inc SBx00 Azalia (Intel HDA) [1002:4383] - sound not working on HP Pavilion tx2500 Notebook PC in Ubuntu 9.10 - using ALSA driver 1.0.20

Your ALSA mixer settings show that the Master volume channel is muted in gnome-alsamixer:

Please unmute it.

# Simple mixer control 'Master',0
# Capabilities: pvolume pvolume-joined pswitch pswitch-joined
# Playback channels: Mono
# Limits: Playback 0 - 64
# Mono: Playback 50 [78%] [-14.00dB] [off]

how to change it? . i'm not cmd expert.
one more thing. in the sound preference; there is no device to configure. The only device is dummy Output.

already unmute using gnome alsa mixer.
still no change. the only hardware device is dummy output. thanks

Please send us the output from step 4 from this procedure:

https://help.ubuntu.com/community/SoundTroubleshootingProcedure

hanafi@hanafi-laptop:~$ cat /proc/asound/cards; sudo aptitude install paman gnome-alsamixer alsa-utils flashplugin-nonfree-extrasound; aplay -l; sudo lshw -C sound; ls -lart /dev/snd; cat /dev/sndstat; lspci -nn; sudo which alsactl; sudo fuser -v /dev/dsp /dev/snd/* ; dpkg -S bin/slmodemd; lsmod | grep snd
 0 [SB ]: HDA-Intel - HDA ATI SB
                      HDA ATI SB at 0xd2400000 irq 16
[sudo] password for hanafi:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Writing extended state information... Done
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
Writing extended state information... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done

**** List of PLAYBACK Hardware Devices ****
card 0: SB [HDA ATI SB], device 0: ALC268 Analog [ALC268 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: SB [HDA ATI SB], device 6: Si3054 Modem [Si3054 Modem]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
  *-multimedia
       description: Audio device
       product: SBx00 Azalia (Intel HDA)
       vendor: ATI Technologies Inc
       physical id: 14.2
       bus info: pci@0000:00:14.2
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: driver=HDA Intel latency=64
       resources: irq:16 memory:d2400000-d2403fff
total 0
crw-rw----+ 1 root audio 116, 2 2009-11-23 17:43 timer
crw-rw----+ 1 root audio 116, 3 2009-11-23 17:43 seq
crw-rw----+ 1 root audio 116, 6 2009-11-23 17:43 pcmC0D0p
crw-rw----+ 1 root audio 116, 7 2009-11-23 17:43 pcmC0D0c
crw-rw----+ 1 root audio 116, 8 2009-11-23 17:43 hwC0D1
crw-rw----+ 1 root audio 116, 9 2009-11-23 17:43 hwC0D0
crw-rw----+ 1 root audio 116, 10 2009-11-23 17:43 controlC0
drwxr-xr-x 2 root root 60 2009-11-23 17:43 by-path
drwxr-xr-x 3 root root 240 2009-11-23 17:43 .
crw-rw----+ 1 root audio 116, 4 2009-11-23 17:43 pcmC0D6p
crw-rw----+ 1 root audio 116, 5 2009-11-23 17:43 pcmC0D6c
drwxr-xr-x 17 root root 3900 2009-11-23 18:04 ..
Sound Driver:3.8.1a-980706 (ALSA v1.0.20 emulation code)
Kernel: Linux hanafi-laptop 2.6.31-14-generic-pae #48-Ubuntu SMP Fri Oct 16 15:22:42 UTC 2009 i686
Config options: 0

Installed drivers:
Type 10: ALSA emulation

Card config:
HDA ATI SB at 0xd2400000 irq 16

Audio devices:
0: ALC268 Analog (DUPLEX)

Synth devices: NOT ENABLED IN CONFIG

Midi devices: NOT ENABLED IN CONFIG

Timers:
31: system timer

Mixers:
0: Realtek ALC268
00:00.0 Host bridge [0600]: Advanced Micro Devices [AMD] RS780 Host Bridge [1022:9600]
00:01.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (int gfx) [1022:9602]
00:04.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 0) [1022:9604]
00:05.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 1) [1022:9605]
00:06.0 PCI bridge [0604]: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 2) [1022:9606]
00:11.0 SATA controller [0106]: ATI Technologies Inc SB700/SB800 SATA Controller [AHCI mode] [1002:4391]
00:12.0 USB Controller [0c03]: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller [1002:4397]
00:12.1 USB Controller [0c03]: ATI Technologies Inc SB700 USB OHCI1 Controller [1002:4398]
00:12.2 USB Controller [0c03]: ATI Technologies Inc SB700/SB800 USB EHCI Controller [1002:4396]
00:13.0 USB Controller [0c03]: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller [1002:4397]
00:13.1 USB Controller [0c03]: ATI Technologies Inc SB700 USB OHCI1 Controller [1002:4398]
00:13.2 USB Controller [0c03]: ATI Technologies Inc SB700/SB800 USB EHCI Controller [1002:4396]
00:14.0 SMBus [0c05]: ATI Technologies Inc SBx00 SMBus Controller [1002:4385] (rev 3a)
00:14.1 IDE interface [0101]: ATI Technologies Inc SB700/SB800 IDE Controller [1002:439c]
00:14.2 Audio device [0403]: ATI Technologies Inc SBx00 Azalia (Intel HDA) [1002:4383]
00:14.3 ISA bridge [0601]: ATI Technologies Inc SB700/SB800 LPC host controller [1002:439d]
00:14.4 PCI bridge [0604]: ATI Technologies Inc SBx00 PCI to PCI Bridge [1002:4384]
00:14.5 USB Controller [0c03]: ATI Technologies Inc SB700/SB800 USB OHCI2 Controller [1002:4399]
00:18.0 Host bridge [0600]: Advanced Micro Devices [AMD] Mobile K10 [Turion X2, Athlon X2, Sempron] HyperTransport Configuration [1022:1300] (rev 40)
00:18.1 Host bridge [0600]: Advanced Micro Devices [AMD] Family 11h [Turion X2, Athlon X2, Sempron] Address Map [1022:1301]
00:18.2 Host bridge [0600]: Advanced Micro Devices [AMD] Mobile K10 [Turion X2, Athlon X2, Sempron] DRAM Controller [1022:1302]
00:18.3 Host bridge [0600]: Advanced Micro Devices [AMD] Mobile K10 [Turion X2, Athlon X2, Sempron] Miscellaneous Control [1022:1303]
00:18.4 Host bridge [0600]: Advanced Micro Devices [AMD] Mobile K10 [Turion X2, Athlon X2, Sempron] Link Control [1022:1304]
01:05.0 VGA compatible controller [0300]: ATI Technologies Inc RS780M/RS780MN [Radeon HD 3200 Graphics] [1002:9612]
08:00.0 Network controller [0280]: Broadcom Corporation BCM4322 802.11a/b/g/n Wireless LAN Controller [14e4:432b] (rev 01)
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 02)
/sbin/alsactl
                     USER PID ACCESS COMMAND
/dev/snd/controlC0: Slmodemd 1161 F.... slmodemd
/dev/snd/pcmC0D6c: Slmodemd 1161 F...m slmodemd
/dev/snd/pcmC0D6p: Slmodemd 1161 F...m slmodemd
sl-modem-daemon: /usr/sbin/slmodemd
snd_hda_codec_si3054 4636 1
snd_hda_codec_realtek 203328 1
snd_hda_intel 26984 3
snd_hda_codec 75708 3 snd_hda_codec_si3054,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 7200 1 snd_hda_codec
snd_pcm_oss 37920 0
snd_mixer_oss 16028 1 snd_pcm_oss
snd_pcm 75488 6 snd_hda_codec_si3054,snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_seq_dummy 2656 0
snd_seq_oss 28576 0
snd_seq_midi 6432 0
snd_rawmidi 22208 1 snd_seq_midi
snd_seq_midi_event 6940 2 snd_seq_oss,snd_seq_midi
snd_seq 50224 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer 22276 2 snd_pcm,snd_seq
snd_seq_device 6920 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
snd 59204 17 snd_hda_codec_si3054,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore 7264 1 snd
snd_page_alloc 9252 2 snd_hda_intel,snd_pcm
hanafi@hanafi-laptop:~$

thanks a lot.
problem solved.

Thanks Mark Rijckenberg, that solved my question.