Re: via82xx 1.0.0rc1 experience

[Takashi Iwai <tiwai@suse.de>]

At Thu, 4 Dec 2003 13:47:07 +0100 (CET),
Tim Goetze wrote:
> 
> i have a new box with an ASRock K7VM2 board, it comes with an on-board
> audio interface:
> 
> <lspci -vv>
> 00:11.5 Multimedia audio controller: VIA Technologies, Inc. AC97 Audio
> Controller (rev 50)
>         Subsystem: Unknown device 1849:3059
>         Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop-
> ParErr- Stepping- SERR- FastB2B-
>         Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium
> >TAbort- <TAbort- <MAbort- >SERR- <PERR-
>         Interrupt: pin C routed to IRQ 22
>         Region 0: I/O ports at cc00 [size=256]
>         Capabilities: [c0] Power Management version 2
>                 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
>                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> </lspci>
> 
> it works fine on 2.4.22 with alsa-driver-1.0.0rc1 and these module
> options:
> 
> <modules.conf>
> options snd-via82xx index=0 id=ac97 ac97_clock=48000 dxs_support=2
> </modules.conf>
> 
> other dxs_support values cause block-size *and* erratic distortion in
> the output sound. ac97_clock=44100 causes slowed-down playback.

ok, i'll add dxs_support=2 as default for your board.
(still i'm wondering dxs_support=1 or 4 might work.)

as default, ac97_clock is 48000, so you don't need to specify it.
a different ac97_clock shouldn't be given unless the chip is really
driven in that clock.

> however, to enable analog output (only one present on the board) the
> mixer controls for 'headphone' not 'master' must be unmuted (volume
> and playback switch). since they aren't accessible from alsamixer this
> had me puzzling for a while.

please show /proc/asound/card0/codec97#0/* files.
the mixer assignment depends on ac97 codec, not the sound DMA chip
itself.



> one question remains: iiutc, the hw DACs run at a fixed rate of 48kHz.

no, it's in the case dxs_support=3 (and 0 if no pre-definition).

thanks for the feedback.


ciao,

Takashi


-------------------------------------------------------
This SF.net email is sponsored by: SF.net Giveback Program.
Does SourceForge.net help you be more productive?  Does it
help you create better code?  SHARE THE LOVE, and help us help
YOU!  Click Here: http://sourceforge.net/donate/