[ltp] T61 Feedback noise

[Richard Neill]

John Jason Jordan wrote:
> For the past week or so I have been hearing a wailing noise and I can't
> figure out where it's coming from or what is causing it. The sound is
> exactly like the sound a microphone makes in an auditorium when being
> set up and the volume is too loud or some other component needs to be
> reoriented - that is, it comes and goes and it fades in and out as I
> move my hands around the computer. It happens only at home when the
> computer is docked in the mini-dock, so it must have something to do
> with the dock.
> 

Is the sound coming out of the speakers? (try muting them; does it go 
away? try plugging in headphones?)

Your description could be exactly correct: the hand-waving will alter 
standing waves. Try muting the speakers, or playing with the various 
volume mixer options. I recommend gnome-alsamixer or alsamixergui - some 
of the less common "knobs" may make a difference.

HTH,

Richard






> It started a week or so ago. Unfortunately, I make five or ten changes
> to the computer every day, installing, uninstalling things, changing
> settings, and so on. It happens even right after booting when no
> applications have been launched yet.
> 
> Has anyone else ever experienced this?