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Everytime I shut my computer down or reboot it there is a very loud pop/crack from the speakers. It sounds dangerous, like they are going to blow up. Is there a way to automatically mute the volume on shutdown?

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The popping is not a result of your computer not being muted; it's probably a result of capacitor discharge being sent to your speakers.

From what you've said, it sounds like you have a set of external speakers? If this is the case, turn them off before booting down; this will prevent any discharge from being amplified, and therefore being heard.

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In my case, clicking doesn't occur when shutting down Windows, only when shutting down Ubuntu. Of course, the cause of the click is physical - capacitor or spark, but the pre-cause is possible the disgraceful shutting down of the sound card. – mbaitoff Apr 29 '12 at 13:54

That's a known bug: Do you have an HP laptop?

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Open terminal and do:

Code: gksudo gedit /usr/lib/pm-utils/power.d/intel-audio-powersave Find this line:


and comment it out by putting a "#" in front of it like this:


Just below this line you make a new line, like this:


So now you will have:


Save the file (File > Save) and exit.

Reboot the computer.

The popping sound will be gone.

NOTE: If you for some reason need to undo the setting, just open the file again and remove the "#" from:


and delete this line:


Save the file.


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You need turn EAPD off in alsa driver.

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Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – fossfreedom May 5 '13 at 8:24

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