Bob Wya, thank you for reporting this and helping make Ubuntu better. Hardy 
desktop reached EOL on May 12, 2011.
Please see this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We were wondering if this is still an issue on a supported release? If
so, can you try with the latest development release of Ubuntu? ISO CD
images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command in a
supported release from a Terminal (Applications->Accessories->Terminal).
It will automatically gather and attach updated debug information to
this report.

apport-collect -p linux <replace-with-bug-number>

Also, if you could test the latest upstream kernel available that would
be great. It will allow additional upstream developers to examine the
issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once
you've tested the upstream kernel, please remove the 'needs-upstream-
testing' tag. This can be done by clicking on the yellow pencil icon
next to the tag located at the bottom of the bug description and
deleting the 'needs-upstream-testing' text. Please let us know your
results.

Thanks in advance.

** Tags added: gutsy hardy jaunty needs-upstream-testing

** Description changed:

  Binary package hint: alsa-base
  
  The chipset is in an Acer Aspire 8920G laptop. But please note that this
  appears to be a generic chipset with a lot of users experiencing the
  same problems (and possibly the same solution??)
  
  This bug applies to Ubuntu 8.04 (final), 8.10 (final) and 9.04 (beta
  release). In each case all available updates were applied to the Ubuntu
  OS release.
  
  I am currently using ALSA 1.0.18 (fully updated from Jaunty
  repositories).
  
  Output of lspci -v -v is attached.
  
  I tried following the Ubuntu audio faqs (e.g. switching to Pulse Audio)
  to no effect...
  
  Basically I cannot switch on the digital optical SPDIF output or get any
  analogue sound output!!
  
- THIS IS A SERIOUS PROBLEM AS JAUNTY IS STILL BROKEN AND SO MANY PEOPLE
- ARE AFFECTED!!
- 
  NB I know the "snd-hda-intel" kernel driver module supports the audio
  device... It still needs a simple work around however and doesn't work
  out of the box!!
  
- Bob
+ WORKAROUND: Add:
+ "options snd-hda-intel model=6stack-dig probe_mask=1"
+ 
+ to the end of the file:
+ 
+ /etc/modprobe.d/alsa-base.conf

** No longer affects: alsa-driver (Ubuntu)

** Tags removed: gutsy
** Tags added: intrepid

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/354398

Title:
  Acer Aspire 8920G has inaudible audio by default

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