Date: Tue, 24 Feb 2009 13:45:25 -0500 From: Ben Kaduk <minimarmot@gmail.com> To: Alexander Motin <mav@freebsd.org> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Annoying whitenoise sound coming from snd_hda enabled chipset Message-ID: <47d0403c0902241045g73b4068fp4a1032e51f752f0e@mail.gmail.com> In-Reply-To: <49A43CE5.5030701@FreeBSD.org> References: <1235218982.00077642.1235207402@10.7.7.3> <499FFC5F.3020903@FreeBSD.org> <47d0403c0902210949i74473bc5j57c923e13c85e89@mail.gmail.com> <47d0403c0902240939h317c0454qfa2b5246f60d42d3@mail.gmail.com> <49A43CE5.5030701@FreeBSD.org>
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On Tue, Feb 24, 2009 at 1:31 PM, Alexander Motin <mav@freebsd.org> wrote: > Ben Kaduk wrote: >> >> On Sat, Feb 21, 2009 at 12:49 PM, Ben Kaduk <minimarmot@gmail.com> wrote= : >>> >>> On Sat, Feb 21, 2009 at 8:06 AM, Alexander Motin <mav@freebsd.org> wrot= e: >>>> >>>> Garrett Cooper wrote: >>>>> >>>>> =A0 I don't know how else to describe it, but when I turn up my >>>>> speakers enough (50%+) and don't have any sound playing, I hear a >>>>> whitenoise hiss coming out of them. When I change webpages (nvidia >>>>> driver is GIANT locked) or do something else kernel intensive it stop= s >>>>> for a brief second, but apart from that it's an annoying trill sound >>>>> almost like a mosquito humming around me waiting to be swatted. >>>> >>>> I think it may be radio interference with disconnected microphone >>>> inputs. >>>> Try to set all unneeded mixer volumes to 0, especially mic, monitor, >>>> speaker >>>> and mix. Inputs often have too sensitive 20-30dB pre-amplifiers. Some >>>> codecs >>>> have them on all inputs. >>> >>> It's hard to be sure, since I'm not sure that I could describe what I >>> hear any better than Garret did, but I think I'm seeing the same sort >>> of thing on my work desktop. =A0I'll try setting unneeded volumes to >>> zero the next time I'm in, and see if that helps. >>> >>> dmesg and pciconf are available here: >>> http://stuff.mit.edu/afs/sipb.mit.edu/user/kaduk/freebsd/periphrasis/ >> >> I'm still getting the noise, even with these mixer settings: >> periphrasis# mixer >> Mixer vol =A0 =A0 =A0is currently set to =A025:25 >> Mixer pcm =A0 =A0 =A0is currently set to =A025:25 >> Mixer speaker =A0is currently set to =A0 0:0 >> Mixer mix =A0 =A0 =A0is currently set to =A0 0:0 >> Mixer rec =A0 =A0 =A0is currently set to =A0 0:0 >> Mixer monitor =A0is currently set to =A0 0:0 >> Recording source: > > You have set vol and pcm to 25. They are measured not in percents now, th= ere > are a logarithmic scales inside codec, so, depending on model, 25 may mea= n > something like -30dB, when you will be able to hear codec's native noise > margin, which can quite high cheap codecs and cheap boards. > > Set your mixer to 80-100 and reduce volume on you speakers/amplifier. > Sadly, I am using headphones, with no additional amplification. I think I was using the same or similar mixer settings in the old world ord= er, with the same loudness at my ear. I would be surprised if the change to logarithmic scale is solely responsible for this noise, but it is plausible ... -Ben Kaduk
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