如何讓膝上型電腦上的非硬碟驅動器、非風扇相關的嗡嗡聲“安靜”？

我們的電子裝置偶爾會發出意想不到的、極其惱人的噪音，讓我們大吃一驚，因此找到解決辦法是當務之急。但是，當所有常見的“嫌疑犯”都不是問題的起因時，你會怎麼做？今天的超級使用者問答帖子為絕望的讀者提供了一些有用的建議。...

我們的電子裝置偶爾會發出意想不到的、極其惱人的噪音，讓我們大吃一驚，因此找到解決辦法是當務之急。但是，當所有常見的“嫌疑犯”都不是問題的起因時，你會怎麼做？今天的超級使用者問答帖子為絕望的讀者提供了一些有用的建議。

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

問題

超級使用者讀者Szabolcs想知道如何消除膝上型電腦上非硬碟驅動器、與風扇無關的嗡嗡聲：

I have a new Dell Inspiron 15 7547 laptop and it makes an annoying high-pitched buzzing sound whenever running on AC power.

This is not HDD noise (there is a separate normal sound when the HDD is working). It is not fan noise (that is also present and it is different/quieter). It is also not coming from the speakers (the noise does not respond to volume control).

The buzzing noise is correlated with CPU usage. Low CPU usage results in a loud noise while high CPU usage results in no noise. For example, continuously scrolling in the browser will shut it up.

I know that electronic components can make noise, and I believe that this is the case. Is there anything I can do to shut it up? The buzzing is just as loud as the HDD’s noise, but it never stops and becomes really annoying.

有沒有辦法讓這種惱人的嗡嗡聲安靜下來？

答案

超級使用者貢獻者Josip Medved和Roger為我們提供了答案。首先，Josip Medved：

As the noise is connected to the load (and thus current c***umption), this might be a case of a noisy DC-to-DC converter whose switching frequency falls into the audible range.

It is hard to tell whether it is serious or not, but I would definitely look into replacing the laptop if it is still under warranty as a big shift in DC-to-DC switching frequency can quite often have an impact on the voltages it generates.

Even if it is currently working without problems, you might find some of more sensitive components just dropping dead one-by-one over the long-term.

接著是羅傑的回答：

I think I had the same problem a while back. When the CPU is working at full speed, it is silent, but when the workload is lower, the CPU goes into power-saving mode. That is when it started making noise.

My problem was solved by switching off D-States in the BIOS. Amazingly, neither the computer support at our company nor the two engineers DELL sent out to fix the noise could solve my problem. Luckily, I found the answer on the Internet.

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