snd_via8233 - no volume control

Aleš ales.rom at
Sun Sep 4 03:19:20 PDT 2005

Hi all.

I have Asrock K7VT4A Pro motherboard with via VT8237 chipset. Sound is 
great, I just can not control the volume. I know it is a known issue, 
but maybe this information can help someone to resolve this problem. I 
run FreeBSD 5.4-RELEASE-p6.

I applied a patch from, 
but still no luck.
After that dmesg shows:

dmesg | grep pcm
pcm0: <VIA VT8237> port 0xc400-0xc4ff irq 22 at device 17.5 on pci0
pcm0: <Unknown AC97 Codec (id = 0x434d4983)>
pcm0: <VIA DXS Enabled: DXS 4 / SGD 1 / REC 1>

cat /dev/sndstat
FreeBSD Audio Driver (newpcm)
Installed devices:
pcm0: <VIA VT8237> at io 0xc400 irq 22 kld snd_via8233 (5p/5s/1r/0v 
channels duplex default)

Win driver says it is a CMI 9761A codec. If I boot from "live" FreeSBie 
CD, 1.1 it is the same situation.

Thanks for your support, Ales.

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