Unofficial Sun Blade 100 FAQ : Sun Blade 100 hardware questions : Why does the motherboard sometimes make a high pitched noise?
Depending on the video output, the Blade sometimes makes a very unpleasant, high-pitched electronic noise. The noise is continuous and seems to change like a modem modulating when you move things on screen. It is often heard when viewing dark web pages with bright text in Netscape, for example. The worst thing is that the noise can be quite loud. I looked into this problem, as have Sun, and it’s due to signal coupling in the motherboard. The sound chip is right next to the graphics chip, and when you run at 24 bits colour mode the graphics chip operates at a high enough frequency to cause breakthrough. I have found that completely disconnecting the internal speaker from the motherboard (front right on the riser board, under the fan cable) solves the problem. If you use the 8 bit colour mode, this also addresses the problem. This is obviously a serious flaw in the design of the Blade! Workarounds: 1. Leave or set back the display depth to 8 bit: % m64config -depth 8 Then exit out of CDE
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