On 09/18/12 18:01, 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?
Doug
Electrically that's usually oscillation (too high gain or too much
electrical feedback) or an unshielded input. My guess would be that
there is an input that is defined and active in software, but is a
loose, ungrounded pin in real life. Like a second microphone input on
the chip, but not actually connected, would be my guess. Can you try
purging out nids that you don't use with loader tunables (set their as
to 0)? Or sysctls as reboots aren't as necessary anymore with snd_hda?
Maybe something changed in software that is seeing inputs that were not
present. Also just try muting all inputs with mixer...
Just a guess, but when I hear squealing/whistling/howling I think
"analog" before I think "digital"...
Matt
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