Re: [gentoo-user] speakers have no sound but headphones have

["Chuanwen Wu" <wcw8410@gmail.com>]

I am very sorry that brought you guys the inconvenience. I am very
surprise, too. Just as what I usually do, I opened the firefox,
logined my gmail account, then wrote and sent out the email which you
have received.

On 10/19/07, Mick <michaelkintzios@gmail.com> wrote:
> On Thursday 18 October 2007, Chuanwen Wu wrote:
> > 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.
> >
> > When I used $alsamixer -V all, I got these informations:
> >
> > Card: HDA Intel
> >  │ Chip: SigmaTel STAC9228
> >     │ View:  Playback  Capture [All]
> >        │ Item: Master [dB gain=-33.75, -33.75]
> > Item: PCM [dB gain=-10.00, -10.00]
> > Item: Front [dB gain=-45.00, -47.25]
> > Item: Mic as Output
> > Item: IEC958
> > Item: ADCMux
> > Item: InMux [dB gain=30.00, 30.00]
> >   Item: InVol [dB gain=16.50, 16.50]
> >
> > As you can see, Mic and IEC958's values are both 0.
>
> We probably can't see what you're describing.  Can you unmute one at a time or
> increase their volume to check if someting gives?
As you know, the output of alsamixer is in graphics mode, so  I felt
very uncomfortable when I described this problem and selected the
information from alsamixer. I appology for this.
Thanks goodness we have  amixer:

$ 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'

You can see above that, I have set the largest volume(100%) except the
"Mic as Output" and 'IEC958' and 'ADCMux', I am not very sure what
their functions are when controlling  my sound card.


>
> > I always think that headphones are equal with speakers, because  them
> > are both connected to the same thing in physics.
> > But now, why my headphones are aloud but my speakers are silent.
> > In Windows xp, both of them work very well. Headphones were after I
> > insert them and otherwise, the speakers loud .
>
> I too thought that this is a hardware issue . . .
I also consider the switching  between headphone and speakers attached
as hardware. So I am also surprised when I found this problem.


I use the Alsa-driver-1.0.14-rc3, which is a unstable one. And the
weird thing is that *ONLY* this version's driver can drive my sound
card. I also tried the in-kernel(2.6.22-r2) one; the version 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.
> --
> Regards,
> Mick
>
>

Best regards,

wcw