The sound I was hearing was intermittent, every 5-10 seconds so I'd guess that when the computer is in sleep mode, no signal is sent to the monitor and therefore it goes through its cycle of checking each input for a signal in turn. So I had a little play around with the settings and while there was no "quick power-on" function, I found that changing the input selector from "Auto" to "DVI" (or whatever input is being used) has totally fixed the issue! To resolve this, go to your Device Manager, right-click Dell Wireless 350 Bluetooth Module (at least, that’s what it’s called on my machine), and select properties. Well, one idea was that some monitors have a setting to make them turn on faster - when this is on, the lighting component is constantly heated so it turns on faster (doesn't sound great for the environment!). As a result, the Bluetooth device turns off, and this evidently allows the processor to move into a C3 state, thus causing the high-pitched noise. I've just found the solution to an irritating problem with one of my computer monitors that makes a high-pitched sound when the computer is in sleep mode.Ī quick Google search showed quite a few people were having this issue with various brands of monitors (mine's an iiyama) and the general solution seemed to be "they're only $100, buy another one".
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