Date: Wed, 19 Sep 2012 14:06:15 -0400 (EDT) From: Benjamin Kaduk <kaduk@MIT.EDU> To: Doug Barton <dougb@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: squealing/whistling audio Message-ID: <alpine.GSO.1.10.1209191400400.861@multics.mit.edu> In-Reply-To: <5059194F.4090002@FreeBSD.org> References: <5059194F.4090002@FreeBSD.org>
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On Tue, 18 Sep 2012, Doug Barton wrote: > Sometime in the last couple of months an old problem has resurfaced on > HEAD, a sort of squealing/whistling sound in the audio, even without > anything playing. The sound is similar to the wind whistling through > something. > > Before I blindly go off on a bisecting spree, does anyone have a > suggestion as to where I might look? It calls to mind this thread: http://lists.freebsd.org/pipermail/freebsd-current/2009-February/003608.html (with later followups http://lists.freebsd.org/pipermail/freebsd-current/2009-July/009839.html and http://lists.freebsd.org/pipermail/freebsd-current/2009-July/009850.html (and others?)) I had relief in my headphones with machdep.idle=spin, though that is only really useful when I am not paying my electricity bill... I agree with Matt that the noise is physically coming from analog leakage/crosstalk, and a software remedy will be something like disabling unused lines/pins. -Ben Kaduk
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