Re: Inexplicable mixer control creation

[Randy Cushman <rcushman_linux@earthlink.net>]

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Takashi Iwai wrote:
> At Tue, 13 Mar 2007 20:21:08 -0400,
> Randy Cushman wrote:
>   
>> In attempting to implement my proposed mixer control name changes (see 
>> "[Alsa-devel] RFC: Enhance AD AC '97 mixer control names") I have 
>> encountered behavior that makes no sense to me:  If module 
>> snd_ac97_codec does not create a control with the name 'PCM Playback 
>> Volume' then something else creates a control with that name.  Not 
>> surprisingly, this phantom control serves no useful purpose in my 
>> environment, as it has no affect on AC '97 control registers.
>>     
>
> This is done by softvol plugin used in the default configuration for
> many onboard chip drivers.  See alsa-lib/src/conf/cards/*.conf.
>
>   
I haven't spent much time in alsa-lib.  I'll take a look.

This may be a good time to mention that I am unable to access the 
Mercurial repository.  If I try to access 
http://hg-mirror.alsa-project.org in a web browser or use the "hg clone" 
command, I get "HTTP Error 403: Forbidden".  Curiously, I can "hg diff" 
repositories I cloned previously.  (I opened bugtrack ticket #2956 this 
morning.)

In the mean time, I'll look at alsa-lib-1.0.14rc3.

> That's actually a point that I missed.  Many apps assume either
> "Master" or "PCM" mixer exists.  Thus, removing PCM isn't nice for
> them. 
>
>
> Now I'm considering whether changing the volume names in the driver
> level is actually a better choice.  It's basically simpler, and I
> prefer a simpler solution.  OTOH, it may bring other messes because of
> the name incompatibility like above.  So, the cleanest solution would
> be some mangling in the user-space, i.e. inside alsa-lib.  But, it's
> a bit harder way.
>
>   
I was planning to change the names by calling snd_ac97_rename_vol_ctl() 
from functions patch_ad1986_specific(), etc. in ac97_patch.c.  I'll 
explore the alsa-lib approach.

> So, before doing this -- we have to *seriously* consider to get
> consensus what control names should be used as standard and how they
> behave.  Maybe better to start another thread for discussing this...
>
>   
I can start another thread.
> Takashi
>
>
>   


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