[Openvortex-dev] Re: AC97 codec odd behaviour (STAC9708/11) / Aureal Card IS SUPPORTED!

[Raymond]

Takashi Iwai wrote:
> At 12 Jun 2003 17:51:50 -0400,
> Manuel Jander wrote:
>
> > Hi everyone,
> >
> > I'm facing some odd things with a Aureal MX300 with a
> > AC97 codec. For some reason the AC97 interface doesnt
> > set the EAPD (external amp enable) bit correctly, and i have 
> > to set it explicitly after calling the ac97  mixer initializer.
> >
> > Maybe, that the AC97 codec write function actually implemented
> > for the Aureal cards "misses" some writes, but i just want to be sure
> > if this bit works for other cards with a STAC9708/11 or similar
> > codec that need this bit by default, or if i really need to set it
> > myself ??
>
>
> i recommend you to do this in the card driver level.
>
> the use of EAPD is dependent upon the devices.  also, some uses EAPD
> pin for different purposes...
According to datasheet of STAC9708, the general purpose register (0x20)
has 3D, MIX, MS, LPBK bits.

Is "POP" a undocumented feature of STAC9708 ?

Simple mixer control 'PCM Out Path & Mute',0
  Capabilities: enum
  Items: 'pre 3D' 'post 3D'
  Item0: 'post 3D'

0-0/0: SigmaTel STAC9708,11

Capabilities     : -headphone out-
DAC resolution   : 18-bit
ADC resolution   : 18-bit
3D enhancement   : SigmaTel 3D Enhancement

Current setup
Mic gain         : +0dB [+0dB]
POP path         : post 3D        <-------------------------
Sim. stereo      : off
3D enhancement   : off
Loudness         : off
Mono output      : MIX
Mic select       : Mic1
ADC/DAC loopback : off
Extended ID      : codec=0 rev=0 SDAC DSA=0
Extended status  : SDAC

numid=43,iface=MIXER,name='PCM Out Path & Mute'
  ; type=ENUMERATED,access=rw---,values=1,items=2
  ; Item #0 'pre 3D'
  ; Item #1 'post 3D'
  : values=0


STAC9708 on other sound cards such as Soundblaster 4.1

http://thread.gmane.org/gmane.linux.alsa.devel/4818