kern/110244: sound broken on ASUS A6R laptop

[vecinabp]

>Number:         110244
>Category:       kern
>Synopsis:       sound broken on ASUS A6R laptop
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 12 23:50:05 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     vecinabp
>Release:        6.2
>Organization:
>Environment:
FreeBSD dhcppc0 6.2-RELEASE-p1 FreeBSD 6.2-RELEASE-p1 #0: Sun Feb 18 11:58:47 UTC 2007     richardpl@:/usr/obj/usr/src/sys/PKERNEL  i386

PKERNEL is generic kernel with SC_PIXEL_MODE option added
but it also happen on any previous generic version of FreeBSD
>Description:
part of output:
pciconf -lv:
pcm0 at pci0:20:5: class=0x040100 card=0x11831043 chip=0x43701002 rev=0x80 hdr=0x00
    vendor   = 'ATI Technologies Inc'
    class    = multimedia

scanpci:
pci bus 0x0000 cardnum 0x14 function 0x05: vendor 0x1002 device 0x4370
 ATI Technologies Inc IXP SB400 AC'97 Audio Controller

Simple test:

cat /dev/urandom > /dev/dsp0.0 

Something is playing (really hard to hear), but not how it should be on machine with sound working.

Changing volume with mixer small improvement can be arhived, but still useless.
Playing normal sound - nothing can be really hear (sometimes something can - KDE sound test - but again really hard to hear and not everything is played)
>How-To-Repeat:
# kldload snd_atiixp

try to play any sound file, just for example:
# timidity demo.mid
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: