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HP launches Linux-loaded Eee PC rival (Register Hardware)HP launches Linux-loaded Eee PC rival (Register Hardware)Posted Apr 9, 2008 12:43 UTC (Wed) by Los__D (subscriber, #15263)In reply to: HP launches Linux-loaded Eee PC rival (Register Hardware) by broonie Parent article: HP launches Linux-loaded Eee PC rival (Register Hardware)
Nope, that's not (only) it. My last system (a Centrino laptop) had audible noise from the motherboard itself (not the speakers), a few centimeters behind the CPU. Some simple LED display units in a company I worked for, had a similar noise from the control logic (No speakers, and no fan). I don't know what it is, but on those display units, it came from a single transistor, as far as I could hear (AFAICH? :)).
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HP launches Linux-loaded Eee PC rival (Register Hardware) Posted Apr 9, 2008 12:59 UTC (Wed) by rfunk (subscriber, #4054) [Link] I seem to recall that sort of noise being a sign that a component was about to fail.
HP launches Linux-loaded Eee PC rival (Register Hardware) Posted Apr 9, 2008 13:57 UTC (Wed) by Los__D (subscriber, #15263) [Link] Yep, the funny part is that it was not only mine, but several Centrino laptop we had in my class at college back then (3 or 4 laptops). OTOH, the backlight failed 3 years later, so it could have been the inverter making the noise (I guess a high voltage component is more likely to make audible noises), but it lived in imminent failure-state for a long time, then. :) - The displays at the company stopped doing it after redesigning the control system, and indeed it was a sign of a error, but in the design, not the component (I can't remember the details, I was just a lowly tester).
HP launches Linux-loaded Eee PC rival (Register Hardware) Posted Apr 9, 2008 14:00 UTC (Wed) by zlynx (subscriber, #2285) [Link] http://groups.google.com/group/linux.kernel/browse_thread... That's a link to a Linux Kernel thread about singing components. Apparently the problem became much worse on systems running Linux with a 1,000 Hz tick rate.
HP launches Linux-loaded Eee PC rival (Register Hardware) Posted Apr 10, 2008 10:56 UTC (Thu) by NRArnot (subscriber, #3033) [Link] There are magnetic components (transformers, inductors) in the power supplies, including the DC/DC converter that steps down battery voltage to the 1.something V that the CPU wants. You can see them on the motherboard usually clustered around the CPU. They almost inevitably vibrate as the magnetic field changes. They are driven at an ultrasonic frequency (up to a few MHz), but the frequency is modulated by the work that the CPU is doing, and it's possible for annoying audible squeaks or chirps to be emitted under some workloads.
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