Date: Thu, 11 Jan 2007 00:57:22 -0500 From: Bob McIsaac <bobmc@bobmc.net> To: questions@freebsd.org Subject: Re: Laptop speaker vs earphone Message-ID: <45A5D1C2.3090002@bobmc.net> In-Reply-To: <200701110548.l0B5mrkO055630@banyan.cs.ait.ac.th> References: <BAY21-F22038C9A959D56253D9756CCB10@phx.gbl> <200701110548.l0B5mrkO055630@banyan.cs.ait.ac.th>
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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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