Sound on iMac 27 inch: no sound

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Dear Folks,

I have two iMac 27" machines.  I have installed Fedora 11 (with all
updates).  I have not been able to persuade sound to work, and many
others appear to share the same problem.  I am looking for any ideas
that I could follow.

$ lspci -nn | grep Audio
00:08.0 Audio device [0403]: nVidia Corporation MCP79 High Definition Audio [10de:0ac0] (rev b1)
02:00.1 Audio device [0403]: ATI Technologies Inc R700 Audio Device [Radeon HD 4000 Series] [1002:aa38]

pavucontrol shows sound bars on whatever output I choose; just no
sound comes out of the speakers or the headphone jack.

The output of alsa-info is at
http://nicku.org/imac-sound-problem/alsa-info-pamsbox-201004241812

If I can provide any further information, I will be happy to do so.

At the moment, I would be happy to get sound working even if that
involves buying additional hardware.  iMacs are rather closed
kinds of systems.
-- 
Nick Urbanik             http://nicku.org           nicku@xxxxxxxxx
GPG: 7FFA CDC7 5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24 ID: BB9D2C24

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