[Bug 15099] Breezy Preview - No laptop speaker output, headphone works

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Ubuntu (laptop) | linux


jdthood at yahoo.co.uk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jdthood at yahoo.co.uk
         AssignedTo|jdthood at yahoo.co.uk         |ben.collins at ubuntu.com
             Status|UNCONFIRMED                 |NEW
          Component|alsa-base                   |linux
     Ever Confirmed|0                           |1
          QAContact|                            |kernel-bugs at lists.ubuntu.com




------- Additional Comments From jdthood at yahoo.co.uk  2005-09-19 08:25 UTC -------
In response to my question on the alsa-devel mailing list upstream provided
the following information.

Motherboards and sound cards that contain the same sound chips do not all have
the same connections with the outside world.  So, for some, setting EA to 1
enables sound; for others setting EA to 0 enables sound.

The only way we can overcome this is on a case by case basis. We add code to
the driver so that it recognises a particular motherboard and set EA correctly
for that particular motherboard.

So, the best way to fix this problem will be to open an ALSA bug report on
https://bugtrack.alsa-project.org/alsa-bug/ or on the kernel bug tracker
with full details of the motherboard and the sound chips involved, and it
will eventually be fixed.

The following information should be provided:

* The default settings, when not working:
  + The output of "amixer"
  + the contents /proc/asound/card0/codec97#0/ac97#0-0
  + the contents of /proc/asound/card0/codec97#0/ac97#0-0+regs

* The settings when working correctly:
  + The output of "amixer"
  + the contents /proc/asound/card0/codec97#0/ac97#0-0
  + the contents of /proc/asound/card0/codec97#0/ac97#0-0+regs

* The output of "lspci -vvn"

I encourage those working on the Ubuntu Linux kernel to collect the
requested information and send it upstream.

Since upstream agrees to fix this problem in the driver, it is best
if /etc/init.d/alsa-utils does not set EA.  (Currently /e/i/alsa-utils
does not set EA, so no change is required.)

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