Public bug reported:

I am running Intrepid but this problem existed before with Hardy as
well.

The problem occurs when playing sound through the laptop's built-in
speakers, if the volume drops below a certain amount, I hear a cracking
sound and the volume totally cuts off. When the sound goes above that
amount, I hear another crack and the sound comes back.

In some cases, I can increase the volume (which raises the threshold) so
it will not cut in/out as often, but it is still happens.

I get perfect sound when using the headphones.

This happens with any application, MP3 playback with Amarok, Juk,
Youtube videos in Firefox, etc...

I have a Thinkpad T42 with an Intel sound controller and uses the
"snd_intel8x0" kernel module.

lspci shows the following for the audio controller.
     Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio 
Controller (rev 01)

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
Sound cuts in/out totally (with a crack) when the level passes a certain 
threshold
https://bugs.launchpad.net/bugs/286630
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