System -> Administration -> Soundcard detection no longer hear sound

[stan]

Darlene Wallach wrote:
> stan wrote:
>> Darlene Wallach wrote:
>>> While I was installing Fedora 7, I heard sound during
>>> the sound test. After Fedora 7 was installed, I tried
>>> System -> Administration -> Soundcard detection and I
>>> heard sound.
>>>
>>> I installed Macromedia, mplayer, vlc. I tried to watch
>>> youtube and did not hear sound. I used the
>>> System -> Preferences -> Personal -> volume control
>>>
>>> I now do not hear sound when I select
>>> System -> Administration -> Soundcard detection.
>>>
>>> What could explain the soundcard not being detected?
>>>
>>> Should I reinstall Fedora 7?
>>>
>>> I sent an email out on Monday, 20th Aug to which noone
>>> has responded. Are people tired of helping people get
>>> sound working? Is the subject of no interest?
>>>
>>> If anyone can give advice or feedback, I would appreciate
>>> it. Can someone point me to documentation?
>>>
>>> Thank you for your attention and consideration,
>>>
>>> Darlene Wallach
>>>
>> See if your sound card has been detected.
>> aplay some.wav    this will use the default device
>> aplay -D plughw:0,0 some.wav  uses a different plugin than default
>>
>> You can also look at aplay -lLv to see the info alsa has about your 
>> card and how it has configured it.
>> There is lots of information in /proc/asound as well.
>>
>> By default alsa starts with sound muted, so use either the alsa mixer 
>> gui
>> or alsamixer in a terminal to adjust at least the master sound level.
>>
>> If you have more than one soundcard, it is possible that they were 
>> assigned in a different order than you expect.  This requires 
>> explicit assignment it /etc/modprobe.conf.  Lately, I've noticed this 
>> occurring by default.
>>
>> Some applications need to be configured to use the card.
>>
>> And yes,  this question has been asked and answered many times on the 
>> list.  The answer has to be out there somewhere on the web, for sure 
>> on either the alsa-user list or this list at gmane.org.
>> I'm sure you find the subject of interest. :-)
>>
>> I've had pretty good luck with sound, the basic functions have just 
>> worked.  If you are using an obscure chip, or a troublesome chip it 
>> can be problematic.  And because every sound card is different, only 
>> someone familiar with your card can really go beyond the basic stuff 
>> above.  For those, the alsa lists are probably the best bet.  They 
>> can also tell you if it is even supported.
>>
>
> I did check all the email on the Fedora list regarding
> sound problems with Fedora 7. What I did not see was
> someone asking about sound working on the sound test
> during installation and after installation, then the
> sound test failing.
>
> I do not understand what to do change on alsamixer either
> the cli or the gui to try to get sound working again.
>
> I tried aplay on a .au file and heard nothing.
>
> I don't know what to put in google to even get close to
> getting results that will be useful.
>
> I am very frustrated with myself for somehow screwing up
> sound that once worked.
>
> Darlene Wallach
>
If it once worked, it will work again.  That is a positive.
What kind of card is it?

Does aplay -lLv show any output, or does it say 'no sound device detected'?
default:CARD=Revolution51
    M Audio Revolution-5.1, ICE1724
    Default Audio Device
front:CARD=Revolution51,DEV=0
    M Audio Revolution-5.1, ICE1724
    Front speakers
surround40:CARD=Revolution51,DEV=0
    M Audio Revolution-5.1, ICE1724
    4.0 Surround output to Front and Rear speakers
surround41:CARD=Revolution51,DEV=0
    M Audio Revolution-5.1, ICE1724
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Revolution51,DEV=0
    M Audio Revolution-5.1, ICE1724
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Revolution51,DEV=0
    M Audio Revolution-5.1, ICE1724
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Revolution51,DEV=0
    M Audio Revolution-5.1, ICE1724
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Revolution51,DEV=0
    M Audio Revolution-5.1, ICE1724
    IEC958 (S/PDIF) Digital Audio Output
null
    Discard all samples (playback) or generate zero samples (capture)
**** List of PLAYBACK Hardware Devices ****
card 0: Revolution51 [M Audio Revolution-5.1], device 0: ICE1724 [ICE1724]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: Revolution51 [M Audio Revolution-5.1], device 1: IEC1724 IEC958 
[IEC1724 IEC958]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Revolution51 [M Audio Revolution-5.1], device 2: ICE1724 
Surrounds [ICE1724 Surround PCM]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1

Or, equivalently, when you look in /proc/asound do you see information?  
Does it exist?
card0  cards  devices  modules  oss  pcm  Revolution51  seq  timers  version

If you don't see either of the above, your sound card is not detected.   
Do the dmesg below to find out why.

If there is a card, do this.
Open a terminal.  Type alsamixer.
You will be on the master volume control.  Push the up arrow until it is 
at a reasonable height, just below the red or just in the red.  Press 
escape.

Now try your sound again.

Do a "dmesg | grep -i snd"
and a "dmesg | grep -i alsa"

If your sound is not installing, there will be messages indicating 
errors in the output.
Please post those errors.