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spdif/iec958 stopped working

$ uname -a
Linux lain #1 SMP Mon Mar 23 23:08:10 EDT
2009 x86_64 x86_64 x86_64 GNU/Linux

# lspci -vvv -s 00:08.0
00:08.0 Audio device: nVidia Corporation MCP79 High Definition Audio
(rev b1)
        Subsystem: ASUSTeK Computer Inc. Device 82fe
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0 (500ns min, 1250ns max)
        Interrupt: pin A routed to IRQ 23
        Region 0: Memory at fbe78000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

It used to work just fine in both analog & IEC958 modes. It was working
as of night of 4/29-4/30.
Overnight, however, the / filled up due to several large xbmc core
dumps. Last night the sound stopped working, which led me to discover
the filled up partition. After cleaning up about a gig, the digital
sound still doesn't work. Analog sound works just fine, though.

Somewhat interesting to note - when I enable IEC958 in the volume
control panel, the receiver switches from analog mode. (the computer is
an HTPC, both analog & digital outputs go to the receiver). I suppose
it's possible that the receiver died, but I feel software cause is much
more likely.

I didn't find any smoking guns in /var/log/messages - the only
audio-related message was about pulse not being able to run with real
time priority (which is normal, from what I gather)

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