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[311005901 <nitrousinacan@xxxxxxxxx>]

I have an iMac 9,1 with the same problem: no audio from internal
speakers or headphone jack. The solution did not fix my problem, and I
think you mean "/etc/modprobe.d/alsa-base.conf"

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC885 Analog [ALC885 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: ALC885 Digital [ALC885 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

-- 
no sound after update with hda intel alc883 alsa solution included
https://bugs.launchpad.net/bugs/323116
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Support, which is the registrant for Mactel Support.

Status in ALSA driver: New
Status in Mactel Support: New
Status in “linux” source package in Ubuntu: Incomplete

Bug description:
Summary
=======
After installing todays updates (using Update Manager) 30 Jan 2009, required reboot, all sound stopped working on my Acer Aspire 5630 (5633wmli) with ALC883 sound card.
Tinkering with alsa config (+reboot) made work again (see below).


Command line output
=============
$ lsb_release -rd
Description:	Ubuntu 8.10
Release:	8.10

$ uname -a
Linux david-laptop 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686 GNU/Linux

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC883 Analog [ALC883 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC883 Digital [ALC883 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

$ apt-cache policy alsa-base
alsa-base:
  Installed: 1.0.17.dfsg-2ubuntu1
  Candidate: 1.0.17.dfsg-2ubuntu1
  Version table:
 *** 1.0.17.dfsg-2ubuntu1 0
        500 http://ftp.sunet.se intrepid/main Packages
        100 /var/lib/dpkg/status


Solution
=======
Adding 

options snd-hda-intel model=auto 

to /etc/modprobe.d/alsa-base and rebooting solved the problem.