snd_hda peculiarities

[Mark Moellering]

Richard L. Mace wrote:
> I recently installed FreeBSD 8.0 (amd64) on my laptop (HP 8510w) and most 
> things are working. However, a minor annoyance is that I only get sound if I 
> manually load snd_hda via:
>
> # kldload snd_hda
>
> i.e., after booting. If I place the following in /boot/loader.conf
>
> snd_hda_load="YES"
>
> I get no sound, even though the driver seems to load and cat /dev/sndstat 
> gives
> ----------------------------------------------------------------------------------------------------------------------
> FreeBSD Audio Driver (newpcm: 64bit 2009061500/amd64)
> Installed devices:
> pcm0: <HDA Analog Devices AD1981HD PCM #0 Analog> at cad 0 nid 1 on hdac0 kld 
> snd_hda [MPSAFE] (1p:1v/1r:1v channels duplex default)
> pcm1: <HDA Analog Devices AD1981HD PCM #1 Digital> at cad 0 nid 1 on hdac0 kld 
> snd_hda [MPSAFE] (1p:1v/0r:0v channels simplex)
> ------------------------------------------------------------------------------------------------------------------------
>
> Googling, I found this page: 
>
> http://lists.freebsd.org/pipermail/freebsd-bugs/2009-June/035677.html
>
> Which reports precisely the behaviour I am experiencing. No fix or workaround 
> is suggested.
>
> Has anyone with similar hardware managed to get this driver working? Any 
> workarounds to my problem? My audio hardware is...
>
> $pciconf -lv 
> <stuff omitted>
> hdac0 at pci0:0:27:0:      class=0x040300 card=0x30c5103c chip=0x284b8086 
> rev=0x03 hdr=0x00        
>     vendor     = 'Intel Corporation'                                                            
>     device     = 'Intel audio controller embedded with the 82801H chipset ( 
> ICH8 chipset ) (82801H)'                                                                                            
>     class      = multimedia                                                                     
>     subclass   = HDA 
>
> And I am using
> $ uname -a
> FreeBSD belenos 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:02:08 UTC 
> 2009     root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
>
> Many thanks
> -Richard
>
>   
I had the same problem.  Unfortunately, I am not at home to look at the 
exact solution but I know it involves setting the sound channel in 
sysctl.conf  I think if you look in some of the relevant man apges, it 
might give you a hint.  something like snd.channel = 1 or something 
similar.  When I get home I will try and post the solution.

Mark