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?
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.
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.
That's a known bug: https://bugs.launchpad.net/ubuntu/+bug/373452 Do you have an HP laptop?
You need turn EAPD off in alsa driver.