On Sat, 1 Jul 2017 01:05:17 +0000 (UTC),
bob prohaska , in
 wrote:
>  The audio seemed to be disabled after an update earlier today.
>  Machine is RPI3, uname -a reports
>
>  Linux raspberrypi 4.9.28-v7+ #998 SMP Mon May 15 16:55:39 BST 2017 armv7l
GNU/Linux
>
>  The machine has been using audio (via HDMI) by default and no intentional
>  changes were made.
>
>  If I do try to change audio settings using raspi-config, a dialog reports
>  There was an error running option A4 Audio
>  and nothing changes.
>
>  The audio icon in the upper right menu bar has a red X through it.
>
>  It's tempting to think a driver went missing, but I've no clue where to
>  look; up to now audio has worked without so much as a thought.
>
>  Anybody got a hint?

Sounds like a kernal module isn't being loaded. I have a new Pi3, and
this is what I see:

# lsmod | grep -i snd
snd_bcm2835            24427  0
snd_pcm                98501  1 snd_bcm2835
snd_timer              23904  1 snd_pcm
snd                    70032  3 snd_timer,snd_bcm2835,snd_pcm

Same kernel, I installed the OS a week ago, and updated it this
morning. Seems to work just fine, audio wise. If the modules are
loading properly, make sure the account is in the audio group:

% groups
pi adm dialout cdrom sudo audio video plugdev games users input netdev
gpio i2c spi

Try running alsamixer, that may give a more verbose error message.

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