[alsa-devel] CMI8788/AV200/Oxygen Volume Controls in alsamixer (oxygen_mixer.c:dac_volume_get())
John.Utz at dmx.com
Fri Jan 23 20:07:56 CET 2009
Sorry in advance about how i write mail today, i am working from home so i have to use exchange webmail.
From: Clemens Ladisch [mailto:clemens at ladisch.de]
Sent: Fri 1/23/2009 5:51 AM
To: John Utz
Cc: ALSA Developers
Subject: Re: [alsa-devel] CMI8788/AV200/Oxygen Volume Controls in alsamixer (oxygen_mixer.c:dac_volume_get())
John L. Utz III wrote:
> It appears to me that these functions are attempting to work on all of
> the channels at once instead of just choosing Master, Front, Rear,
> Surround, or what have you:
Yes, the "Master" control is one control with eight channels.
JU Argh, yet another implementation strategy from a vendor. Too bad, but remember, this is why we use ALSA now instead of OSS. :-)
> this leads to a rather awkward result in alsamixer where there are 5
> volume controls called "Master":
> < Master > Master Master Master Master
> IMHO, it would be more desirable for them to say:
> < Master > Front C/LFE Surround Rear Surr
Alsamixer chooses to display an eight-channel control this way. This
can be considered a bug in alsamixer.
JU It *could*, but that's probably an impractical perspective. zillions of other drivers present this data in the way that amixer, alsamixer and many other mixers expect.
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