ATI IXP400 issue : very low output

Pierre Emeriaud at
Wed Mar 20 17:26:03 UTC 2013

Hello Patrick, list,

2013/3/13 Patrick Lamaiziere <patfbsd at>:
> Le Sat, 9 Mar 2013 15:04:15 +0100,
> Pierre Emeriaud < at> a écrit :
> Hello,
>> I have a sound issue with my recently-installed FreeBSD. The
>> motherboard has a ATI IXP400 with an ALC655 chip.
>> At first I thought that output wasn't working. But increasing the
>> volume on the amplifier I was using resulted in a *very* weak sound
>> output, which sounds like a leakage current being amplified. Whereas
>> I'm using an application (I've been testing with vlc) or directly
>> piping random to /dev/dsp0, I get the same output level.
> I've seen something similar on a Macbook pro (very very low output). I
> must add an "ovref" quirk.
> (/boot/loader.conf)
> hint.hdaa.0.config="ovref"

I've tried this, no change unfortunately. This looks like a snd_hda
driver quirk, which I'm not using, and snd_atiixp doesn't show any
obvious quirks.

AC97 however has some, and AC97_F_EAPD_INV looks suspicious. On a
fedora forum I found that someone put "snd-atiixp ac97_quirk=inv_eapd"
as driver option. Is there a way with Freebsd to change the value of

Anyway, thanks for the suggestion Patrick :)


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