FreeBSD 7.0 – Finding and Loading the Correct Sound Driver

After getting my desktop setup (following these steps) I realized that I didn’t have working sound.  It took me a bit of digging around and help from IRC to find out how.  I hope to make this a bit easier for others by getting it on the web and into the infinite wisdom of Google.

First of all you need to find the right module.  The method that I used initially was a bit of a shotgun approach, but it ended up telling me the right module in the end.

If you’re coming from Linux you might be familiar with the ‘modprobe’ tool for adding and removing modules from your kernel.  In FreeBSD this tool is ‘kldload’.  So, what we’ll do is load the ‘snd_driver’ module, which will end up telling us which one.  This may take some time and your machine may be unresponsive for a few moments.  Don’t panic (…unless, of course, it remains unresponsive for more than five-minutes).

kldload snd_driver

cat /dev/sndstat

On my machine I get the following output, which tells me I should use the ‘snd_hda’ module.

FreeBSD Audio Driver (newpcm: 32bit 2007061600/i386)
Installed devices:
pcm0: <Intel 82801H High Definition Audio Controller> at memory 0xf6dfc000 irq 21 kld snd_hda [20071129_0050] [MPSAFE] (1p:1v/1r:1v channels duplex default)

To autoload this module at boot time you’ll want to add the module to your /boot/loader.conf file:

snd_hda_load=”YES”

If your output reports a different module the syntax is still the same.  module_name_load=”YES”

Unfortunately, on the D630 and D830, this only activates sound from the headphones but not the built in speakers.  A workaround(?) that I found was to add another line to activate the built in speakers.  The following line goes in your /boot/device.hints file.

hint.pcm.0.config=”gpio0,gpio1,gpio2,gpio3,gpio4,gpio5,gpio6,gpio7″

note: I don’t know which of the gpioX values actually does the trick, but leaving all of them in doesn’t seem to negatively affect anything.  If anyone knows which value(s) actually does the job I’d appreciate the help.  (I haven’t had the time to try each one or a combination, followed by reboots, to test.)

One thought on “FreeBSD 7.0 – Finding and Loading the Correct Sound Driver

  1. That is kool, used the generic, and nver got the best out of it. Now I used your method and used the specific driver, wow, am happy. good on my PCBSD workstation

    Cheers
    Edward

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>