09-02-2005
OK. Sorted. It wasn't the kernel version but the ALSA utilities. For some reason, the version of ALSA utils didn't match up with newer ALSA versions as far as what mixer elements are available. There is an extra element called "Internal Amp" that was muted. The older version of 'alsasmixer' couldn't control this as it didn't even display. When I upgraded my alsa-utils with the latest version from source, 'alsamixer' had access to this additional element and I was able to unmute my sound.
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LEARN ABOUT FREEBSD
snd_via8233
SND_VIA8233(4) BSD Kernel Interfaces Manual SND_VIA8233(4)
NAME
snd_via8233 -- VIA Technologies VT8233 bridge device driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device sound
device snd_via8233
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
snd_via8233_load="YES"
DESCRIPTION
The snd_via8233 bridge driver allows the generic audio driver, sound(4), to attach to the VIA VT8233 audio devices. These audio chipsets are
integrated in the southbridge on many VIA based motherboards.
Runtime Configuration
The following sysctl(8) variables are available in addition to those available to all sound(4) devices:
dev.pcm.%d.polling Experimental polling mode, where the driver operates by querying the device state on each tick using callout(9).
Polling is disabled by default. Do not enable it unless you are facing weird interrupt problems or if the device
cannot generate interrupts at all.
HARDWARE
The snd_via8233 driver supports the following audio chipsets:
o VIA VT8233
o VIA VT8233A
o VIA VT8233C
o VIA VT8235
o VIA VT8237
o VIA VT8251
SEE ALSO
sound(4)
HISTORY
The snd_via8233 device driver first appeared in FreeBSD 4.7.
AUTHORS
This manual page was written by Joel Dahl <joel@FreeBSD.org>.
BUGS
The snd_via8233 driver does not support S/PDIF. There is partial support in the code, so implementing it should be fairly easy if the right
hardware is available.
BSD
November 29, 2006 BSD