S/PDIF indication wrong?

[Magnus Sandin <magnus@sandin.cx>]

Hello!

On my ASUS P5P800-VM motherboard, the onboard AC97-chip (Realtek ALC655)
does not indicate that there are any S/PDIF functionality available.

However, the manufacturer (Asus) claim that there are S/PDIF output on
the board, and of course there is.

I created a patch that check the PCI subsystem vendor id and device id,
and if it's a match to this board it ignores the AC97_EI_SPDIF bit when
the controls are built.
This allows me to get the desired S/PDIF output to work just as expected.

I'm not sure this is good practise to just ignore this bit or force the
bit to 1?

I have checked the BIOS for settings regarding S/PDIF, but there are
none. The only audio setting available is to control if the chip shall
be enabled or disabled.

What do you recommend in this case?

You can find more information about this issue on the bugtracker:
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2372

Regards
// Magnus


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