I have done a series of steps to try and track down the cause of this
problem and where in the code the problem is:

- After disabling the on-board PCI sound device in BIOS:

First I tried to play *.wmv in kaffeine, but upon hitting play, kaffeine
locks up.

I then tried to load up Amarok, which failed

In authentication log:

amarokapp       gethostby*.getanswer: asked for "", got "."

I got the same error in same for kaffeine. ie. gethostby*.getanswer:
asked for "", got "."

processes (eg. amarokapp and amarok) don't start up, but are sleeping in
the system monitor and each time I try to launch it, it adds another
instance to the system monitor and another line of gethostby*.getanswer:
asked for "", got "." in the authentication log

After reboot, I start kaffeine again. Kaffeine doesn't lock-up...yet,
and the authentication log does not show  gethostby*.getanswer: asked
for "", got "."

After hitting play,
kaffeine        gethostby*.getanswer: asked for "", got "."
in the authentication log
and kaffeine locks up.

So, it loads initially, but once I hit play, something changes.

I tested two games (that are programmed to function without sound?) and
they do not lock-up. This includes Frozen-Bubble (2?) and TuxTyping.

After re-enabling sound device in bios:

I loaded up a .wmv file in kaffeine, which played without a lock-up...not yet 
anyways.
This time, it manages to play without locking up yet. I tested a wmv and an MP3.
After playing around with kaffeine, trying to get it to lock-up again, I 
started up Amarok. I was able to play about about 30secs of audio before it 
locked up. I was able to start Amarok again (no 'sleeping' and no authorisation 
log entries (they must be related to having no sound device)) after terminating 
it...but upon hitting play, it locked-up again. I then started Kaffeine, and 
hit play and it locked-up too. So, once the sound locks up in one application, 
it locks up the rest.

I rebooted, and logged in again. I tried Kaffeine. No lock-ups. I then
tried Amarok. A few seconds of playback, then the lock-up error! Amarok
must be doing something to cause the lock-up! Kaffeine seems to be able
to play the files for a decent amount of time before the error occurs.

I have also noticed that after the lock-up issue occurs, when I log out of KDE 
and try to log in to Gnome, the system locks-up with just the background 
(before the gnome splash screen loads but after the login screen is gone and 
the resolution changes - The login screen uses a different resolution to 
Gnome). 
This may not be the same the other way around - I can log out of Gnome after 
the lock-up error (if it happens in Gnome) and log into KDE. I tested this, but 
I forgot, thus the use of the words 'may not...'

I use KDE as my primary and default desktop environment

Simply logging out and in will not solve any problems - a reboot is
needed to be able to hear sound and to test again.

My sound device is using ALSA drivers.

Hope this helps to clear some things up and solve the problem

-- 
Feisty - Sound stops after a few seconds and various apps fail to work properly
https://bugs.launchpad.net/bugs/124730
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