Same here. This issue is documented, and is a result of the sound card
being powered back on. I do not think it is something a driver can fix,
as it is obviously an electrical jolt being sent through the chip, and
speakers as a result. One thing that I do think can be fixed is the fact
that when the sound is muted(even in all channels), the sound card is
still powered on when a sound is played. The driver should detect if the
master channel is muted and prevent the sound card from being turned on
if a sound is played.

My two cents.

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CONFIG_SND_AC97_POWER_SAVE: I hear a noisy "toc"
https://bugs.launchpad.net/bugs/119019
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