[pulseaudio-discuss] ALC892 on Clevo P150HM and too many (?) options in pavucontrol

[Julian Sikorski]

W dniu 19.06.2011 18:20, Colin Guthrie pisze:
> 'Twas brillig, and Julian Sikorski at 19/06/11 09:38 did gyre and gimble:
>> Hi,
>>
>> this should be the final thread concerning this laptop. As I mentioned
>> earlier, it has 2.1 speakers, a built-in microphone and the following
>> connectors:
>> - headphone out
>> - microphone in; can be switched to center/lfe out
>> - spdif out; can be switched to rear speaker out
>> - line in; can be switched to side speaker out
>> pavucontrol offers more options, some of which seem superfluous. In the
>> output devices tab, you can pick from analog speakers, analog output and
>> analog headphones (last 2 seem the same).
> 
> These elements come directly from ALSA. Your amixer -c0 output will
> probably show that the relevant kcontrols exist to enable all these
> ports. It's perhaps something that needs to be removed from alsa to
> prevent it bubbling up to PA?
> 
>> In the input devices tab, you
>> can pick microphone 1, microphone 2 and linear input. While it seems
>> technically right (I don't have an external mic here to test), could it
>> be possible to rename them to internal and external mic? #2 is the
>> internal one.
> 
> Yeah, this is actually already the case in git master. The original
> reasoning is that the ALSA controls are very often mislabelled or
> lacking sufficient information to determine which is which (even if some
> hardware is labelled fine, we aim to provide a consistent experience to
> everyone even if that's not as perfect as it could be on some given
> hardware!).
> 
> David has been pushing a lot of fixes to the ALSA layer to fix the
> naming and thus Internal vs External Mic labels are now what is shown in
> PA too.
> 
>> Finally, the profiles in the Configuration tab do not seem to reflect
>> that the machine is capable of up to 7.1 sound. I have
>> - analog stereo duplex
>> - analog stereo output
>> - digital stereo output (iec598) and analog stereo input
>> - digital stereo duplex (iec598)
>> - analog stereo input
>> - off
>> in there. This seems to be completely off what windows offers, so I hope
>> the information I provided will be enough to fix the profiles.
>> Otherwise, I am happy to provide more data.
> 
> We simply try to open the alsa "devices" surround51, surround71 etc. to
> work out if the card is capable of 5.1 or 7.1 sound. If this fails the
> profiles are not offered. I would suggest that there may be some special
> switch you need to turn on in alsa to enable surround51 to work properly
> (I have seen this on some h/w). At the moment we don't handle this too
> well, so we probably need to work out a way of doing this.
> 
> The output from amixer -c0 would likely offer some clues.
> 
> Cheers
> 
> Col
> 

I am attaching the screenshot of alsamixer -c0

Julian
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