I've done some more testing this morning, and it appears that the "ALSA:
emu10k1 - Fix memory corruption" patch from 2.6.23.6 has broken digital
output on my SB Live Value card. Simply replacing the 2.6.23.7 emumixer.c
with the version included in 2.6.23.1 I was able to get digital output
working again under 2.6.23.7.

This does not appear to be a simple matter of adjusting the alsa mixer to
compsensate for how the mixer controls are exposed to userspace. I have
duplicated all alsamixer settings between 2.6.23.1 and stock 2.6.23.7 in
the "F5" view all controls mode, but still received no audio output. I
also tried adjusting other volume controls which normally do not need
adjusting, but got nowhere. It appears that the 2.6.23.6 emu10k1 patch
broke digital output entirely on this card.

Just to add to the information in my first message, the SB Live card is
connected from the yellow jack on the card to the "Digital Coax Input"
connector on my external amplifier.

thanks,
Jim Faulkner


On Fri, 16 Nov 2007, Jim Faulkner wrote:

>
> Hello,
>
> I have an SB Live Value card which uses the emu10k1 driver. I use digital
> output to an external amplifier. This has worked fine for many years, up
> to and including kernel 2.6.23.1. Under 2.6.23.7, I have been unable
> to get any audio output. I get the following errors when loading my
> asound.state under 2.6.23.7 using `alsactl restore`:
> alsactl: set_control:991: warning: name mismatch (IEC958 Playback
> Mask/IEC958 Playback Default) for control #222
> alsactl: set_control:993: warning: index mismatch (3/0) for control #222
> alsactl: set_control:993: warning: index mismatch (0/1) for control #223
> alsactl: set_control:993: warning: index mismatch (1/2) for control #224
> alsactl: set_control:985: warning: iface mismatch (3/2) for control #225
> alsactl: set_control:987: warning: device mismatch (2/0) for control #225
> alsactl: set_control:989: warning: subdevice mismatch (0/0) for control
> #225
> alsactl: set_control:991: warning: name mismatch (IEC958 Playback
> Default/SB Live Analog/Digital Output Jack) for control #225
> alsactl: set_control:993: warning: index mismatch (2/0) for control #225
> alsactl: set_control:995: failed to obtain info for control #225
> (Operation not permitted)
>
> I receive no errors when I load my asound.state under 2.6.23.1.
>
> Under 2.6.23.7, I get the message "No digital data" on my external
> amplifier, which normally I only see when the computer is powered down or
> rebooting. I do not get that message under 2.6.23.1, even when no audio
> is being played.
>
> I've tried copying down my alsamixer settings under 2.6.23.1, and
> re-entering them under 2.6.23.7, however I have still been unable to get
> any audio output.
>
> Here is the relevant part of my `lspci -v`:
> 05:0d.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev
> 08)
> Subsystem: Creative Labs CT4780 SBLive! Value
> Flags: bus master, medium devsel, latency 64, IRQ 23
> I/O ports at dce0 [size=32]
> Capabilities: [dc] Power Management version 2
>
> Please let me know if you need any more information, and please CC my
> e-mail address on any correspondence, since I am not subscribed to this
> list.
>
> thanks,
> Jim Faulkner
>
>
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At Sat, 17 Nov 2007 12:18:29 -0500 (EST),
Jim Faulkner wrote:
>
>
> I've done some more testing this morning, and it appears that the "ALSA:
> emu10k1 - Fix memory corruption" patch from 2.6.23.6 has broken digital
> output on my SB Live Value card. Simply replacing the 2.6.23.7 emumixer.c
> with the version included in 2.6.23.1 I was able to get digital output
> working again under 2.6.23.7.
>
> This does not appear to be a simple matter of adjusting the alsa mixer to
> compsensate for how the mixer controls are exposed to userspace. I have
> duplicated all alsamixer settings between 2.6.23.1 and stock 2.6.23.7 in
> the "F5" view all controls mode, but still received no audio output. I
> also tried adjusting other volume controls which normally do not need
> adjusting, but got nowhere. It appears that the 2.6.23.6 emu10k1 patch
> broke digital output entirely on this card.
>
> Just to add to the information in my first message, the SB Live card is
> connected from the yellow jack on the card to the "Digital Coax Input"
> connector on my external amplifier.

It's no regression of the driver. The problem is just a wrong use of
alsactl in your init script. It should use -F option to ignore
unmatching elements, which is caused when a mixer element is removed
or renamed.

This problem doesn't happen so often (as we try to keep the
compatibility as much as possible), so I didn't realize some distros
still doing wrong for years.

Anyway, this won't be a problem in future since I changed the default
behavior of alsactl to with -F.


Takashi
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