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_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/Received on Wed Apr 23 2003 - 06:46:45 UTC
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