No Sound From Laptop's Internal Speakers

There is no sound from Laptop's Internal Speakers in UBUNTU 9.04..
Perfectly ok when connecting External Speakers..
I don't have this problem while using Windows... Windows support both Internal And External Speakers...

I have collected many information regarding this problem..
I typed the following COMMANDS in Terminal And got respective OUTPUTS...
Please help me solve this problem...
Thank You...

MODEL: Compaq Presario CQ61
SPEAKERS: Built-in Altec Lansing Speakers

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COMMAND: lspci

OUTPUT:(only Audio)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)

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COMMAND: grep "^Codec\|^Vendor Id\|^Subsystem Id\|^Revision Id" /proc/asound/card*/*codec*{,/*} | grep -B2 -A1 $(lspci -nv | grep -A1 0403 | grep Subsystem | sed 's/://g' | awk '{ print $2 }')

OUTPUT:
grep: /proc/asound/card*/*codec*/*: No such file or directory
/proc/asound/card0/codec#0:Codec: IDT 92HD75B2X5
/proc/asound/card0/codec#0:Vendor Id: 0x111d7608
/proc/asound/card0/codec#0:Subsystem Id: 0x103c3069
/proc/asound/card0/codec#0:Revision Id: 0x100202

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COMMAND: cat /proc/asound/cards

OUTPUT:
 0 [Intel ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xd4500000 irq 22
********************************************************
COMMAND: lsmod | grep snd

OUTPUT:

snd_hda_intel 436148 3
snd_pcm_oss 46336 0
snd_mixer_oss 22656 1 snd_pcm_oss
snd_pcm 83076 2 snd_hda_intel,snd_pcm_oss
snd_seq_dummy 10756 0
snd_seq_oss 37760 0
snd_seq_midi 14336 0
snd_rawmidi 29696 1 snd_seq_midi
snd_seq_midi_event 15104 2 snd_seq_oss,snd_seq_midi
snd_seq 56880 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer 29704 2 snd_pcm,snd_seq
snd_seq_device 14988 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
snd 62756 15 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore 15200 1 snd
snd_page_alloc 16904 2 snd_hda_intel,snd_pcm

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COMMAND: sudo aplay -l

OUTPUT:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
*****************************************************
COMMAND: lspci -v | less

OUTPUT: (only Audio)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
        Subsystem: Hewlett-Packard Company Device 3069
        Flags: bus master, fast devsel, latency 0, IRQ 22
        Memory at d4500000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

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