speakers have no sound but headphones have

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Hi,
I have a sound problem with my dell1400 laptop: I have no sound from
the speakers in the laptop but I can have sound from headphones after
I insert them.

$ amixer
Simple mixer control 'Master',0
 Capabilities: pvolume pswitch
 Playback channels: Front Left - Front Right
 Limits: Playback 0 - 127
 Mono:
 Front Left: Playback 127 [100%] [0.00dB] [on]
 Front Right: Playback 127 [100%] [0.00dB] [on]
Simple mixer control 'PCM',0
 Capabilities: pvolume
 Playback channels: Front Left - Front Right
 Limits: Playback 0 - 255
 Mono:
 Front Left: Playback 255 [100%] [0.00dB]
 Front Right: Playback 255 [100%] [0.00dB]
Simple mixer control 'Front',0
 Capabilities: pvolume pswitch
 Playback channels: Front Left - Front Right
 Limits: Playback 0 - 127
 Mono:
 Front Left: Playback 127 [100%] [0.00dB] [on]
 Front Right: Playback 127 [100%] [0.00dB] [on]
Simple mixer control 'Mic as Output',0
 Capabilities: pswitch pswitch-joined
 Playback channels: Mono
 Mono: Playback [on]
Simple mixer control 'IEC958',0
 Capabilities: pswitch pswitch-joined
 Playback channels: Mono
 Mono: Playback [on]
Simple mixer control 'ADCMux',0
 Capabilities: cswitch
 Capture channels: Front Left - Front Right
 Front Left: Capture [on]
 Front Right: Capture [on]
Simple mixer control 'InMux',0
 Capabilities: cvolume
 Capture channels: Front Left - Front Right
 Limits: Capture 0 - 4
 Front Left: Capture 4 [100%] [40.00dB]
 Front Right: Capture 4 [100%] [40.00dB]
Simple mixer control 'InVol',0
 Capabilities: cvolume
 Capture channels: Front Left - Front Right
 Limits: Capture 0 - 14
 Front Left: Capture 14 [100%] [21.00dB]
 Front Right: Capture 14 [100%] [21.00dB]
Simple mixer control 'Input Source',0
 Capabilities: enum
 Items: 'Front Line'
 Item0: 'Front Line'


 # lsmod | grep snd
snd_seq_oss            28160  0
snd_seq_device          4880  1 snd_seq_oss
snd_seq_midi_event      4800  1 snd_seq_oss
snd_seq                40992  4 snd_seq_oss,snd_seq_midi_event
snd_pcm_oss            35936  0
snd_mixer_oss          13056  1 snd_pcm_oss
snd_hda_intel          13920  3
snd_hda_codec         214400  1 snd_hda_intel
snd_pcm                59336  3 snd_pcm_oss,snd_hda_intel,snd_hda_codec
snd_timer              15816  2 snd_seq,snd_pcm
snd                    39976  15
snd_seq_oss,snd_seq_device,snd_seq,snd_pcm_oss,snd_mixer_oss,snd_hda_intel,snd_hda_codec,snd_pcm,snd_timer
soundcore               6944  1 snd
snd_page_alloc          6736  2 snd_hda_intel,snd_pcm


# lspci | grep Audio
00:1b.0 Audio device: Intel Corporation HD Audio Controller (rev 02)

I use the Alsa-driver-1.0.14-rc3, which is a unstable one. And
probably it is the *ONLY* one that can drive my sound card. I also
tried the in-kernel(2.6.22-r2) one; the alsa-driver-1.0.14,
which is the newest stable one that came out after 1.0.14-rc3, and
also the 1.0.15-rc2 one. But none of them work.

Thanks in advanced!
-- 
wcw

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