[alsa-devel] Selecting correct input device port.

[dE]

On 10/30/14 11:12, Raymond Yau wrote:
>
>
> 2014-10-30 下午12:38 於 "dE" <de.techno at gmail.com 
> <mailto:de.techno at gmail.com>> 寫道：
> >
> > On 10/29/14 13:06, Takashi Iwai wrote:
> >>
> >> At Tue, 28 Oct 2014 09:57:18 +0530,
> >> dE wrote:
> >>>
> >>>
> >>> As I learn't in this mailng list, a device can typically handle 
> only one
> >>> stream at a time unless it supports hardware mixing which's 
> exposed via
> >>> subdevices in ALSA
> >>>
> >>> What does subdevice mean for input device?
> >>
> >>
> >> When a device can do multiplexing, the driver can give multiple
> >> substreams (= subdevices).
> >>
> >>> Do they mark physical ports
> >>> for input? If not how do I record from a specific input port?
> >>
> >>
> >> You can pass the subdevice number explicity.  It's -1 as default,
> >> which means to select the next free one.
> >>
> >>> Is it
> >>> automatically selected by the card?
> >>>
> >>> And what's 'input source' in ALSA mixer?
> >>
> >>
> >> It's usually a MUX to select the input source, e.g. line in or mic.
> >>
> >>
> >
> > Input source for single subdevice right? I've 3 sub device, does it 
> have to do anything with the fact that I've 3 input source in 
> alsamixer? Do the 3 input source mark 3 different subdevices?
>
> So far, only those 10 channel hda codecs have three ADC
>
> Due to recent change in snd-hda-intel, if your desktop previously had 
> three subdevices, the new driver create analog capture device with one 
> subdevice and alt analog capture with two subdevices
>

Thanks for clarifying everyone!

Looks like my mobo is bad.