[mythtv-users] RE: Configuring SPDIF digital out.

[Joacim J]

On 12/17/05, Joacim J <jocke4news at gmail.com> wrote:
>
> On 12/17/05, Marius Schrecker <marius at schrecker.org> wrote:
> >
> > > I finally got it working.
> > >
> > > Here is what I did to enable spdif output to my amp when I switched
> > from a
> > > SB Live! 5.1 analog surround card to the on-board audio on my Asus
> > > motherboard.
> > >
> > > The obvious first step was to remove the SB Live! Card from the PC.
> > During
> > > the Power On Self Test (POST), I entered the BIOS settings and enabled
> > the
> > > on-board audio. Saved the settings ant continued with the boot up.
> > >
> > > KDE informed me that the default audio device was missing. I went to
> > the
> > > Start menu --> System Settings --> Soundcard Detection. KDE found my
> > > Soundcard and played a test tune. The analog sound was coming out of
> > my TV
> > > Speakers and nothing was coming out of my Receiver.
> > >
> > > I opened up a terminal and typed alsamixer.  I was given an error
> > message
> > > :
> > >
> > > alsamixer: function snd_ctl_open failed for default: no such file or
> > > directory.
> > >
> > > Googling for that error led me to believe that my modprob.conf file
> > was to
> > > blame so. . .
> > >
> > > # (any text editor) /etc/modprob.conf
> > >
> > > -----Before------
> > >
> > > alias eth0 sk98lin
> > > options snd-emu10k1 index=0
> > > remove snd-emu10k1 { /usr/sbin/alsactl store 0 >/dev/null 2>&
> > > 1 || : ; }; /sbin/modprobe -r --ignore-remove snd-emu10k1
> > > alias char-major-81 cx8800
> > > alias usb-controller ehci-hcd
> > > alias usb-controller1 uhci-hcd
> > > alias ieee1394-controller ohci1394
> > > # nvidia kernel module
> > > alias char-major-195 nvidia-1_0-7174
> > > alias nvidia nvidia-1_0-7174
> > > options snd-intel8x0 index=1
> > > remove snd-intel8x0 { /usr/sbin/alsactl store 1 >/dev/null 2>&1 || : ;
> > };
> > > /sbin/modprobe -r --ignore-remove snd-intel8x0
> > > alias snd-card-0 snd-intel8x0
> > > options snd-card-0 index=0
> > > options snd-intel8x0 index=0
> > > remove snd-intel8x0 { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ;
> > };
> > > /sbin/modprobe -r --ignore-remove snd-intel8x0
> > >
> > > The intel8x0 is my on-board audio device, and the emu10k1 was my old
> > card.
> > > I
> > > commented out the lines referencing my old sound card and made a few
> > > number
> > > changes in the file. This is my file after editing it.
> > >
> > > -------After--------
> > >
> > > alias eth0 sk98lin
> > > #options snd-emu10k1 index=0
> > > #remove snd-emu10k1 { /usr/sbin/alsactl store 0 >/dev/null 2>&
> > > 1 || : ; }; /sbin/modprobe -r --ignore-remove snd-emu10k1
> > > alias char-major-81 cx8800
> > > alias usb-controller ehci-hcd
> > > alias usb-controller1 uhci-hcd
> > > alias ieee1394-controller ohci1394
> > > # nvidia kernel module
> > > alias char-major-195 nvidia-1_0-7174
> > > alias nvidia nvidia-1_0-7174
> > > #changed index=1 to index=0 and ... store 1 to store 0
> > > options snd-intel8x0 index=0
> > > remove snd-intel8x0 { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ;
> > };
> > > /sbin/modprobe -r --ignore-remove snd-intel8x0
> > > alias snd-card-0 snd-intel8x0
> > > options snd-card-0 index=0
> > > options snd-intel8x0 index=0
> > > remove snd-intel8x0 { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ;
> > };
> > > /sbin/modprobe -r --ignore-remove snd-intel8x0
> > >
> > > I rebooted and still no dice. Same error message from alsamixer. I
> > tried
> > > creating a .asoundrc file like like the example on the ALSA website.
> > >
> > > $ vi /home/mythtv/.asoundrc
> > >
> > > pcm.intel8x0 {
> > >    type hw
> > >    card 0
> > > }
> > >
> > > ctl.intel8x0 {
> > >    type hw
> > >    card 0
> > > }
> > >
> > > Still no digital sound. I attempt to run alsamixer and receive this
> > error
> > > message:
> > >
> > > alsamixer: relocation error: alsamixer: symbol
> > > snd_mixer_selem_get_playback_dB, version ALSA_0.9 not defined in file
> > > libasound.so.2 with link time reference
> > >
> > > After a few Google's, I find out what needs to be done.
> > > It is time to update drivers and such. But first a little house
> > cleaning.
> > >
> > > # mv /usr/lib/libasound.so.2 moved.libasound.so.2
> > > # mv /usr/lib/libasound.so.2.0.0 moved.libasound/so/2/0/0
> > >
> > > --- I later went back and deleted them but you can't be too careful
> > ---
> > >
> > > # yum install alsa-utils
> > > # yum install alsa-lib
> > > # yum install alsa-driver
> > >
> > > I tried alsamixer again and it worked.
> > > In alsamixer I un-muted IEC958, turned ICE958 Playback all the way
> > down,
> > > set
> > > ICE958 Playback source to [AC-Link], un-muted External Amplifier,
> > turned
> > > <PCM> and <Master> up to 90%. ESC to exit.
> > >
> > > --- I don't know if all of this was necessary, but it worked for me.
> > ---
> > >
> > > I started up mythfrontend, and navigated to Utilities/Setup -> Setup
> > ->
> > > General. On the 3rd page I selected "Enable AC3 to SPDIF passthrough"
> > and
> > > "Audio output device" was already on "/dev/dsp".
> > > Finish going through the menu's in order to make the settings take
> > effect.
> > > After I verified that it worked, I spent a few minutes patting myself
> > on
> > > the
> > > back, and then decided to save my settings.
> > >
> > > #  /usr/sbin/alsactl store
> > >
> > > --  That's it. I hope someone can find this information useful. -Mat
> > >
> >
>
> I am trying to get my SPDIF to work. I have an onboard soundcard (ASUS A8V
> Deluxe with VIA chipset)
>
> /sbin/lspci -v
>
> 00:11.5 Multimedia audio controller: VIA Technologies, Inc.
> VT8233/A/8235/8237 AC97 Audio Controller (rev 60)
>         Subsystem: ASUSTeK Computer Inc.: Unknown device 812a
>         Flags: medium devsel, IRQ 5
>         I/O ports at e800 [size=256]
>         Capabilities: [c0] Power Management version 2
>
> [mythtv at HTPC ~]$ vi /home/mythtv/.asoundrc
> pcm.via82xx {
>   type hw
>   card 0
> }
>
> ctl.via82xx {
>   type hw
>   card 0
> }
>
> I can turn up alsamixer just fine but can't get any sound to the SPDIF
> (connected to a receiver).
>
> In your description I can not figure out where you sets the ICE958
> Playback source to [AC-Link] as someone else also wondered about.
>
> What can be wrong??
>
> BR Joacim
>

Hmmm, I have some sound when running:

/usr/bin/aplay /usr/share/sounds/KDE_Startup.wav

But the volume is very low and having 100% volume in alsamixer
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