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[Henrique Ferreiro <henrique.ferreiro@xxxxxxxxx>]

I have just tried the maverick beta live cd and it didn't work for me. I
don't know if the alsa driver choosed model=imac91 automatically or not.
I cannot install it right now and don't know how to change that with the
module already loaded. Anyway, either the option doesn't work, or it
isn't being picked by default.

Nor the jack nor the speakers worked for me. Additionally, I tried
changing "Analog Stereo Duplex" to "Digital Stero Duplex", and then
pressing "try it" (or something like that) crashed the sound preferences
application.

** Changed in: alsa-driver (Ubuntu)
       Status: Fix Released => Confirmed

-- 
New iMac (9,1, March 09) headphone jack works, speakers do not
https://bugs.launchpad.net/bugs/346170
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Support, which is the registrant for Mactel Support.

Status in Mactel Support: New
Status in “alsa-driver” package in Ubuntu: Confirmed

Bug description:
I got a new iMac, (version 9,1 March 09). Everything works perfectly except the sound. Sound comes out of the headphone jack. Sound does not come out of the speakers. I've tried numerous fixes, but I think it comes down to the newest iMac hardware not being supported yet. 

lspci-v 

00:08.0 Audio device: nVidia Corporation MCP79 High Definition Audio (rev b1)
	Subsystem: nVidia Corporation Device cb79
	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 15
	Memory at d3580000 (32-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel modules: snd-hda-intel

 aplay -l

**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC883 Analog [ALC883 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: ALC883 Digital [ALC883 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I get the same results in 8.10 and 9.04