snd_hda + NVidia MCP51 hangs

[Tsurutani Naoki]

Hi,

I have a trouble with snd_hda.
With kernel and module built after patch applied, my FreeBSD/i386 6-STABLE is hung-up.
I am not logged in when the host hung, nor using any programs concerning sound.
I tried to dump kernel, but failed; for this is not a kernel panic, i guess.
This happens about a few weeks after booting the system,
and no trouble happens when snd_hda module is not loaded.

% dmesg | grep pcm0
pcm0: <NVidia MCP51 High Definition Audio Controller> mem 0xf7000000-0xf7003fff irq 21 at 
device 16.1 on pci0
pcm0: <HDA Codec: Realtek ALC883>
pcm0: <HDA Driver Revision: 20070105_0038>
% cat /dev/sndstat
FreeBSD Audio Driver (newpcm: 32bit)
Installed devices:
pcm0: <NVidia MCP51 High Definition Audio Controller> at memory 0xf7000000 irq 21 kld snd_hda 
[20070105_0038] (1p/1r/1v channels duplex default)

Is there any known trouble like this ? 
I read the following article:
	Subject: snd_hda + NVidia MCP51 = reboots
	From: Roman Bogorodskiy <novel at freebsd.org> 
	Date: Tue Jan 16 09:31:17 UTC 2007 
but no solution.

---
Tsurutani Naoki
turutani at scphys.kyoto-u.ac.jp