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Take advantage of auto-muting laptops Laptop Macs
I can't test this on any system other than my MacBook, but it probably holds true for other Apple portables: My MacBook remembers whether my computer was muted or not muted when I unplug the headphones. Let me explain...

Normally my computer volume is set to mute so I don't disturb people in the library or classes. Then I often plug in headphones and un-mute the volume to listen to a song or YouTube. When I remove the headphones, the computer automatically goes back to mute. This is similar to the iPod's behavior of pausing a track when removing headphones.

However, if your computer was not muted before you plugged in the headphones, then nothing happens when you remove the headphones. The computer only reverts if you follow this sequence:

Mute computer –> plug in headphones –> un-mute computer -> remove headphones -> computer automatically mutes volume

If you have removed your headphones and the portable has muted your volume, when you put the headphones back in, the computer un-mutes your sound. Thus you can enter a state where whenever you plug your headphones in, the portable automatically un-mutes your sound, and when you remove your headphones, the computer re-mutes your sound.

[robg adds: I tested this on our 12" PowerBook G4, and it didn't seem to work. It definitely works on the MacBook, though.]
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Take advantage of auto-muting laptops
Authored by: Mikey-San on Nov 06, '06 07:35:41AM

I think it's more that Mac OS X remembers, at least on some models, your audio output settings for different output ports. When you plug in headphones or speakers to your machine, the computer knows which port to use for audio, and uses the last setting for that port.

As far as I know, it stores your last setting for every output and input port you have.



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Volume settings remember more than just "mute."
Authored by: velvok on Nov 06, '06 07:43:46AM

I just tested this on my 17" Rev A. Macbook Pro.

When I tried it, I used a track in iTunes for the test. I muted the speakers and plugged in earphones. Sound immediately played through the earphones. When I removed the earphones (without having touched any volume buttons, the laptop speakers remained muted.

Most importantly, the laptop remembers volume settings independently for both speaker and earphones. So if I set volume to 1 for speakers, but then plug in earphones, I can turn the volume up to 8 for them, unplug the earphones, and still be at volume 1 for the speakers. Excellent!

The laptop is definitely remembering two volume settings -- one for speakers and one for earphones. And they're separate.

---
Mark



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Volume settings remember more than just "mute."
Authored by: skrawcke on Nov 06, '06 08:17:41AM

this works for any audio output device, my USB headphones do the same thing.



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Take advantage of auto-muting laptops
Authored by: sk00 on Nov 06, '06 08:55:44AM

This works on my iMac Core Duo as well.

The volume settings are completely seperate for the headset and built-in speakers.



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Take advantage of auto-muting laptops
Authored by: zpjet on Nov 06, '06 09:39:00AM

no, it doesn't work on my 15" alubook (jan 2005). the device's name changes, the volume sliders moves a bit for some reason, but it doesn't remember anything. pity!



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Take advantage of auto-muting laptops
Authored by: luai on Nov 06, '06 09:42:45AM

It also happens with my Nokia bluetooth headset and my MBP.



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Take advantage of auto-muting laptops
Authored by: ganzelini on Nov 06, '06 09:52:02AM

Is there anyway to get this to work on g4 model powerbooks?



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Take advantage of auto-muting laptops
Authored by: morespace54 on Nov 06, '06 12:43:58PM

Alas, it only seems to work with the new Intel computers... :-(



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Take advantage of auto-muting laptops
Authored by: zohar.ma on Nov 06, '06 11:38:31AM

Doesn't work on my PowerBook 12" (2005)



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Take advantage of auto-muting laptops
Authored by: Swordfish on Nov 06, '06 02:21:15PM

This works as you don't restart holding the option key (like when you use Boot Camp). In that case, the external speakers unmute. :(



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Take advantage of auto-muting laptops
Authored by: Swordfish on Nov 06, '06 02:24:59PM
... works as long as you don't restart holding...

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Take advantage of auto-muting laptops
Authored by: xSmurf on Nov 06, '06 03:57:58PM

This has worked for *ever* on my Quicksilver PowerMac between the internal audio and my USB iMic... So yeah it really has nothing to do with Laptops nor recent versions of Mac OS X...

---
MacBook Pro 2.16Ghz / 2Gb / 100Gb 7200rpm / CD/DVD±RW
PM G4 DP 800 / 1.25gb / 120Gb+80Gb / CD/DVD±RW/RAM/DL
- The only APP Smurf



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Take advantage of auto-muting laptops
Authored by: zpjet on Nov 07, '06 12:09:50AM

yeah, but we're talking the headphone plug here. when i plug my firewire sound device, the system remembers its last volume settings. but unfortunately, as i mentioned above, my powerbook, although it reflects the change, doesn't make difference between headphones and built-in speakers, while new intel laptops and as i've just tried, intel mini too, do.



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Take advantage of auto-muting laptops
Authored by: wackybit on Nov 07, '06 04:22:53AM

It's not about muting and not muting. The computer (all MacBooks, including Pros) will remember the last volume setting you had on your output device.



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Take advantage of auto-muting laptops
Authored by: sk00 on Nov 07, '06 03:35:34PM
MacBooks vs iBooks
Authored by: jdv on Nov 08, '06 03:16:54AM
I think the MacBooks have seperate outputs for the builtin speakers and the headphone jack. This is best seen when rebooting the machine - the speakers will play the "Tada.wav"-like sound even with headphones connected. The iBooks on the other hand apparently use the same output for the speakers and headphone jack, since the start up sound will not play on the speakers when a jack is plugged in...

Theoretically it should be possibly to use the speakers and the jack output on the MacBooks simultaneously. Any insights?

As a side note, has anyone else experienced weird crackling sounds when adjusting the volume on an iBook with headphones connected? I also had problems with the balance changing randomly, but fixed them with balanced.

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