[alsa-devel] SPDIF wave audio broken after BIOS update

Takashi Iwai tiwai at suse.de
Fri Sep 24 08:35:38 CEST 2010

At Thu, 23 Sep 2010 14:10:45 +0200,
Manuel Lauss wrote:
> Hello,
> I've updated my system BIOS to fix some issues, however since then wave audio
> over (optical) SPDIF is broken, i.e. I can hear the receiver power up
> but only silence
> comes out. Audio on the analog jacks work, as does transmitting AC3/DTS data
> over spdif.
> Attached is the codec#0 proc info for the non-working case, as well as
> a diff of this
> output between the (old) working and (new) broken bios.

Looks like you set non-audio SPDIF bit accidentally as default.
Thus it doesn't work but for pass-thru mode.
Try to reset it via iecset utility.

> Also, since the update, this message has reappeared (it went away after the
> sound tree merge early in the 2.6.36-rc phase):
> hda_codec: ALC892: BIOS auto-probing.
> ALSA hda_codec.c:337: hda_codec: connection list not available for 0x1f

This shouldn't be a big problem, but for tracking more, I'd need
alsa-info.sh output.  Run with --no-upload option, and attach the


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