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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