On Tue, 14 Oct 2003, Andreas Kotowicz wrote:
> On Tue, 2003-10-14 at 00:36, Ian Romanick wrote:
>
> > Does it still make the sound if you run an external monitor instead of
> > the built-in LCD?
>
> didn't try it out yet.
>
> > My guess is that it has something to do with the
> > frame rate being much, much higher than the refresh rate. That would
> > explain with it does it with gears (which probably runs at hundreds of
> > frame per second) and not tuxracer. My best guess is that it's the
> > display itself that's making the noise. Try setting the
>
> the noise comes from the display. I'm pretty sure about that.
>
> > 'LIBGL_THROTTLE_REFRESH' environment variable (to any value) and re-run
> > gears. That will sync the frame rate to the refresh rate.
>
> setting this variable I hear no more noise. so it's actually the built
> in LCD that can't refresh as fast as 800FPS and is therefore emitting
> this sound. so this is a design issue but not a hardware failure, is it?
I expect it's just a strange electrical phenomenon like a
60 or 50 Hz buzz that some AC appliances emit. Only this one
is at a frequency related to some data transfered to the panel.
Maybe it's a harmonic of the FPS.
Mark.
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