Laptop speaker vs earphone

Bob McIsaac bobmc at
Thu Jan 11 05:59:16 UTC 2007

Olivier Nicole wrote:
>> I'm using Ariff Abdullah's snd_hda driver on 6.2-RC2.
>> The driver reports:
>> pcm0: <ATI SB450 High Definition Audio Controller> mem 0xc0000000-0xc0003fff 
>> irq 16 at device 20.2 on pci0
>> pcm0: <HDA Codec: Realtek ALC883>
>> pcm0: <HDA Driver Revision: 20061210_0037>
> I'd tend to that that the thing that stop the speaker when you plug in
> the earphone is purely mechanical/analog electornic, it is not even at
> the digital electronic level, your OS cannot detect that an earphone
> has been pluged in, it is like your home stereo.
> It ust be a feature of Acer!
> Olivier
A headphone plugged into a speaker line would blast your ears because of
the extreme difference in sensitivity unless the jack switches in a series
resistor to reduce the level.  If you notice poor low-freq response in
your phones, that implies it is a line jack intended for an external
speaker amplifier..  -BobMc-

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