On Thu, 2006-09-21 at 02:09 +0200, Carl-Daniel Hailfinger wrote: > Hi, > > I have noticed some high-pitched noise during each bootup, > estimated frequency is >12kHz. Sounds like a bird chirping, > but with a much higher pitch near the upper hearing range. > The sound is also quite quiet and can't be heard if any > fans of other machines are running. > > Could anybody verify my findings in a quiet room without > air conditioning and other sources of noise? This sound > gives me a headache and at least one other person can > hear it, too.
I've heard something like it too, and when I commented on it to MarkF he said it's normal and is part of the DC electronics stepping down the voltage (or something like that). Somewhat like the high-pitched whine you can hear from the high-voltage flyback transformers in television sets and other CRT-based displays. Maybe that's what you're hearing? Maybe check if it comes from the area around the power plug or not. Dan > I would record it if my microphone wasn't so crappy. > > Regards, > Carl-Daniel > _______________________________________________ > Devel mailing list > [email protected] > http://mailman.laptop.org/mailman/listinfo/devel _______________________________________________ Devel mailing list [email protected] http://mailman.laptop.org/mailman/listinfo/devel
