Problems with hda

Richard Kuhns rjk at
Thu Nov 4 20:02:49 UTC 2010

On 11/04/10 14:41, Doug Barton wrote:
> Howdy,
> Thanks to a generous FreeBSD user I have a shiny new Dell Optiplex 960,
> with the following device:
> hdac0:<Intel 82801JD High Definition Audio Controller>  mem
> 0xf7adc000-0xf7adffff irq 16 at device 27.0 on pci0
> hdac0: HDA Driver Revision: 20100226_0142
> hdac0: HDA Codec #0: Analog Devices AD1984A
> pcm0:<HDA Analog Devices AD1984A PCM #0 Analog>  at cad 0 nid 1 on hdac0
> pcm1:<HDA Analog Devices AD1984A PCM #1 Analog>  at cad 0 nid 1 on hdac0
> There's 2 problems. When I plug the headphones in there are sounds,
> sometimes a low-level sound like a tea kettle whistling, and sometimes a
> louder screeching sound. The other problem is that the front headphone
> jack doesn't work. The rear one works, but this is less than convenient.
> :)  Windows and ubuntu linux do not have either problem with the same
> hardware.
> Doug

I managed to get the front headphone jack to work at the expense of the rear one 
by setting hw.snd.default_unit=2. If it works for you don't forget to put it in 
/etc/sysctl.conf (like I did!).

	- Richard
Richard Kuhns <rjk at>     My Desk:          765-269-8541
Wintek Corporation                 Internet Support: 765-269-8503
427 N 6th Street STE C             Consulting:       765-269-8504
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