kreed wrote:
>
>> <SPECULATION>
>> Also, there is a possibility that the input has more than one function,
>> mic or line, configurable somewhere. I know I have seen outputs referred
>> to as "earphone or line out" (e.g., on my netbook), but I'm not sure I
>> believe it literally.
>> </SPECULATION>
>>
>> Anyway, if I'm wrong, the OP will surely ignore me :-)
>>
>> And if he is using a line input, it's certainly no worse than mistakes I
>> have made...
>>
> There is another possibly overlooked variant to the problem.
> Seems the old AC 97 standard and the "new" HD standard may have
> different connections.
> The MBD and case I'm using requires both a BIOS setting and a different
> header plug to switch from one to the other. (Same case cable, with two
> either or connectors at the MBD end.) I seem to remember that there is a
> difference between the standards at the microphone jack that is used for
> both. At least that's what RealTeks chip data sheet showed.
>
>
> Techie bit:
>
> Main PC
> Intel® X58 / ICH10R Chipset with Intel® Socket 1366 Core™ i7 Processor
> Realtek® ALC889 8-Channel High Definition Audio CODEC (7.1 + 2)
>
> So you can have 7.1 sounds and still have 2 channels for communications
> All sockets can be configured as input or output and are auto-sensing
>
> The front panel mic socket can be switched in software between High
> Definition Audio CODEC and AC97 (makes no difference)
>
> But as I say this is common on other PCs with other sound cards
>
> K
The difference between AC97 mode and HDAudio mode for the front
panel, has to do with jack sensing method. Most commodity computer
cases (used in home builds), come with AC97 wiring, and jack sensing
using HDAudio switch closures isn't used. Instead, impedance sensing is used,
and even in "AC97 mode" the sound chip is perfectly capable of popping
up a wizard to ask you what you just plugged in.
There are actually two AC97 2x5 header patterns. The original one, relies
on looping earphone sound back into the box, to make the rear green LineOut
jack work. On HDAudio chips, with BIOS set to "AC97 mode", there are
enough channels on the HDAudio chip, that the loop back path is no longer
needed, so two pins end up as no-connects on the AC97 2x5 header. And then,
the difference between HDAudio in "HDaudio mode" for front panel, and
HDAudio in "AC97 mode", boils down to the handling of the three sense
pins on the header.
*******
As for sound problems, they go back a ways further than Windows 7.
Between user finger problems, poorly designed custom software control panels,
misapplied jack configurations (INF file), sound has been busted in one way
or another for a long time.
In the Linux world, the main reason for things being busted, is the
abundance of standards and obsolete standards. I have several boxes here
with busted sound, thanks to PulseAudio and changes made to accommodate it.
And the attitude of some of the developers, doesn't help matters. At least
with Windows, the architecture side of things isn't an immediate problem.
(Maybe if you're running a recording studio, but not if all you want
to do is listen to tunes.)
Paul
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