Date: Wed, 23 Apr 2003 11:46:40 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Daniel Eischen <eischen@pcnet1.pcnet.com> Cc: orion@freebsd.org Subject: RE: Recent pcm/ac97 commit breaks all the glass in my house Message-ID: <XFMail.20030423114640.jhb@FreeBSD.org> In-Reply-To: <Pine.GSO.4.10.10304231020050.623-100000@pcnet1.pcnet.com>
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On 23-Apr-2003 Daniel Eischen wrote:
> I get a terrible feedback from pcm immediately upon booting and
> probing my sound chip. It doesn't go away and I have to reboot.
> My system is a Dell 4150 laptop with integrated sound that is
> probed as:
>
> pcm0: <Intel 82801CA (ICH3)> port 0xdc80-0xdcbf,0xd800-0xd8ff irq 11 at device 31.5 on pci0
> pcm0: <Cirrus Logic CS4205 AC97 Codec>
I get the same exact problem on my Dell 5000e. It is quite annoying.
The sound device even seems to be picking up sounds such as keypresses.
I thought my laptop was physically broken when it first happened. :(
> Reverting to revision 1.39 of dev/sound/pcm/ac97.c fixes the problem.
I'll try this in a bit. I can verify that doing 'mixer vol 0' does
solve the problem for me. I tried turning all the other mixers off
first but only muting the master volume fixed the problem.
Ok, it seems that the following change is sufficient:
+#if 0
/* use igain for the mic 20dB boost */
[SOUND_MIXER_IGAIN] = { -AC97_MIX_MIC, 1, 6, 0, 0, 0, 1, 1 },
+#endif
I tried playing with mixer igain (which defaulted to 0), but turning
it up just made things a lot worse.
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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