Public bug reported:

I was told to file a new bug report (see
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/670575)

I installed maverick 10.10 last month (October) and the sound worked
fine until I updated the system on the 5th Nov 2010 (what I do
regularly, last one befoe probably in the beginning of this week).Since
then no sound at all (music, video, skype, system, ...). I tried to
change all settings in the sound preferences, but no effect. I have Dell
1545 (2009 Edition, Intel Core 2 Duo T6400 (2.0GHz,800MHz,2MB), HDA
Intel). Any quick help is appreciated, it is nice to be without sound
...

After some more research, I found following instruction that solved my problem:
*******************
http://ubuntuforums.org/showthread.php?t=1605184&page=3
Using a Terminal="Applications->Accessories->Terminal"
Open this file for editing:
Code: gksudo gedit /etc/modprobe.d/alsa-base.conf

Insert this line at the bottom:
Code: options snd-hda-intel model=3stack
Save. Close. Reboot.

Check your levels in alsamixer.
Code: alsamixer
Press <F6> to select the correct soundcard.
Press <F3> to show playback levels. <F4> selects capture levels [or use <Tab>]
Use the left/right arrow keys to select and up/down arrow keys to change 
levels. <M> to mute/unmute.
Go to "System ->Preferences ->Sound" and make sure the correct soundcard is 
default and adjust your profile on the hardware tab.
On the output tab choose the correct device.
**************

In the last couple of weeks, the sound would sometimes go off and all
get back after a restart. I could not yet find a pattern and it did not
happen for some days.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/688427

Title:
  No sound in all applications (Ubuntu 10.10) after update on the 5th Nov 2010

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