On Fri, 17 Jan 2003, Takashi Iwai wrote:
> this is because we are using DAC2 for the hw:0,0 and DAC1 for hw:0,1.
> i'm not sure why it is.
>
> Jaroslav, is there any drawback to use DAC1 as default playback?
> (i know that the OSS driver uses this order, too.)
This switch was for ENS1370 chip which has DAC0 rates a bit restricted.
I've reversed streams for ENS1371.
> > To
> > select this mode set bit27=bit24=1 and bit26=0. It seems that bit27=1 and
> > bit24=bit26=0 is identical, but the windows driver clearly does the first, so
> > why not? It works...
> >
> > front only, no rear: bit27=0 bit26=0 bit24=0
> > rear mirrors front: bit27=0 bit26=1 bit24=0
> > front & rear independant: bit27=1 bit26=0 bit24=1 (x?)
> >
> >
> > I patched my driver by inserting the following code around line 1947:
> > (I included two lines of overlap to make the location easier to find)
> > =============================================
> > outb(ensoniq->uartc = 0x00, ES_REG(ensoniq, UART_CONTROL));
> > outb(0x00, ES_REG(ensoniq, UART_RES));
> >
> > #ifdef CHIP1371
> > /* enable the rear outputs
> > This seems to work
> > ensoniq->cssr |= (0 << 27) | (1 << 24);
> > but the windows driver does this, so let's
> > also do it */
> >
> > ensoniq->cssr |= (1 << 27) | (1 << 24);
> >
> > /*
> > Use this for mirror mode
> > ensoniq->cssr |= (1 << 26);*/
> > #endif
> >
> > outl(ensoniq->cssr, ES_REG(ensoniq, STATUS));
> > #if defined(CONFIG_GAMEPORT) || defined(CONFIG_GAMEPORT_MODULE)
> > =============================================
> >
> > Maybe there is a better place to put this? I don't know... I put it in the
> > snd_ensoniq_create() function because I always want 4ch output, and I don't
> > see the use of the other modes in an ALSA enviroment.
>
> it would be better to create new controls, and changing the controls
> via hook in the pcm configuration.
Done. Pieter, can you try the latest CVS source. When surround DAC is
found, there should be 'AC97 2ch->4ch Copy Switch' which controls
mirroring / separating channels. The front only configuration will be
used only for cards with no surround DAC. Thank you for your work.
Please, update also alsa-lib and test these commands:
aplay -Drear <some.wav>
aplay -Dplug:surround40 <some.wav>
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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