mac 重置smc_如何（以及何时）在Mac上重置SMC

mac 重置smc

Your Mac is acting funny, and you’ve tried everything: restarting your computer, resetting the NVRAM, and all the tricks that speed up a slow Mac. You even ran 50+ diagnostics at once to see what’s going on, and yet you find nothing. What’s the next step?

您的Mac表现得很有趣，您已经尝试了一切：重新启动计算机，重置NVRAM以及使Mac速度变慢的所有技巧。您甚至一次运行了50多个诊断程序，以查看发生了什么，但是却一无所获。下一步是什么？

You could try resetting the SMC, or System Management Controller, as a last resort. The SMC manages low level settings, like thermal and battery management. It’s rare, but problems with the SMC can effect performance, and also cause bugs like fans that run constantly even when CPU usage isn’t high. If you’re having problems, and have tried everything else, resetting the SMC is a logical next step.

作为最后的选择，您可以尝试重置SMC或系统管理控制器。 SMC管理低级设置，例如热量和电池管理。这种情况很少见，但SMC的问题会影响性能，并且还会导致风扇(即使在CPU使用率不高的情况下也会不断运行)等错误。如果您遇到问题，并且已经尝试了其他所有方法，那么重置SMC是顺理成章的下一步。

The exact method for doing this varies depending on your Mac. Any Mac laptop made since 2009 doesn’t have a removable battery, meaning you’ll need a keyboard shortcut to get the job done. Mac desktops, meanwhile, basically just need to be unplugged. We’ll discuss all your options.

具体执行方法取决于您的Mac。自2009年以来生产的所有Mac笔记本电脑都没有可拆卸电池，这意味着您需要键盘快捷键才能完成工作。同时，Mac台式机基本上只需要拔掉电源即可。我们将讨论您的所有选择。

SMC实际做什么？ (What Does the SMC Actually Do?)

Some functionality of your Mac works regardless of whether it’s turned on. For example: when you plug in the power supply for your Mac laptop, the lights on the charger work even if your Mac is completely shut down. It’s the SMC that makes this possible.

无论Mac是否打开，Mac的某些功能都可以使用。例如：当您插入Mac笔记本电脑的电源时，即使Mac完全关闭，充电器上的指示灯仍会工作。正是SMC使这一切成为可能。

Here’s a complete list of what the SMC does, straight from the Apple website :

这是SMC功能的完整列表，直接来自Apple网站：

Responding to presses of the power button
响应按下电源按钮
Responding to the display lid opening and closing on Mac notebooks
响应Mac笔记本电脑上的显示屏盖打开和关闭
Battery management
电池管理
Thermal management
热管理
SMS (Sudden Motion Sensor)
SMS(突然运动传感器)
Ambient light sensing
环境光感应
Keyboard backlighting
键盘背光
Status indicator light (SIL) management
状态指示灯(SIL)管理
Battery status indicator lights
电池状态指示灯
Selecting an external (instead of internal) video source for some iMac displays
为某些iMac显示器选择外部(而非内部)视频源

If any of these functions are behaving oddly, resetting the SMC could solve it. But problems with the SMC can also occasionally affect system performance. If your Mac runs slowly even when Activity Monitor doesn’t show a lot of CPU usage, and you’ve tried a number of other steps, resetting the SMC might help.

如果这些功能中的任何一个表现异常，则重置SMC即可解决该问题。但是SMC的问题有时也会影响系统性能。如果即使在活动监视器显示CPU使用率不高的情况下Mac仍运行缓慢，并且您尝试了许多其他步骤，则重置SMC可能会有所帮助。

您的电池可拆卸吗？ (Is Your Battery Removable?)

Resetting the SMC works slightly differently on older MacBooks, which offered removable batteries. It’s easy to determine whether your MacBook has a removable battery: just look at the bottom. If you see a single piece of metal, with no slider for removing the battery, your battery is not considered removable for the sake of this tutorial.

重置SMC在旧版MacBook(提供可拆卸电池)上的工作方式略有不同。确定MacBook是否具有可拆卸电池很容易：只需看一下底部。如果您看到一块金属，没有用来卸下电池的滑块，那么出于本教程的考虑，您的电池不被视为可拆卸的。

If, however, you can see a ***** outlining a rectangular section, and there’s some mechanism for opening something nearby, you’ve got a removable battery.

但是，如果您看到一条裂缝勾勒出一个矩形截面，并且附近有某种机制可以打开某些物体，则您有一块可拆卸的电池。

According to Apple, the following models do not offer a removable battery.

根据Apple的说法，以下型号不提供可拆卸电池。

Every MacBook Pro made after late 2009.
2009年底以后生产的每台MacBook Pro。
Every MacBook Pro with Retina
每个配备Retina的MacBook Pro
Every MacBook Air
每台MacBook Air
Every MacBook made since 2009
自2009年以来生产的每台MacBook

Like we said: it’s been a long time since Apple laptops had removable batteries. Odds are yours doesn’t. But resetting the SMC works differently depending on whether you have one, so determine that before proceeding.

就像我们说的：自从苹果笔记本电脑配备可拆卸电池以来，已经有很长时间了。赔率不是您的。但是根据您是否拥有SMC，重置SMC的工作方式有所不同，因此请在继续操作之前确定这一点。

在没有可移动电池的Mac笔记本电脑上重置SMC (Resetting the SMC on a Mac Laptop Without Removable Batteries)

Update: If you have a newer Mac with an Apple T2 Security Chip (found in many Macs released in 2018 or later), you’ll need to use a slightly different process to reset your Mac’s SMC.

更新：如果您拥有配备Apple T2安全芯片的较新Mac(在2018年或更晚发布的许多Mac中都可以找到)，则需要使用略有不同的过程来重置Mac的SMC 。

If you have a MacBook without a removable battery, you can reset the SMC by turning on your computer while holding a specific keyboard shortcut. Here’s what to do.

如果您的MacBook没有可拆卸的电池，则可以在按住特定键盘快捷键的同时打开计算机，以重置SMC。这是要做的事。

Unplug the power, then shut down your Mac.
拔下电源，然后关闭Mac。
Hold the left Shift+Control+Option keys down, then press and hold the power button down. Keep all four buttons pressed down for ten seconds, then let go.

按住左Shift + Control + Option键，然后按住电源按钮。按住所有四个按钮十秒钟，然后放开。
Plug the power cable back in, then turn on your Mac.
重新插入电源线，然后打开Mac。

The SMC is now reset.

现在，SMC已重置。

在带有可移动电池的旧Mac笔记本电脑上重置SMC (Resetting SMC on an Older Mac Laptop With Removable Batteries)

If you have an older MacBook with a removable battery, the keyboard shortcut outlined above will not work. Here’s what you have to do instead.

如果您有带可拆卸电池的较旧MacBook，则上述键盘快捷键将不起作用。这是您要做的。

Shut down your Mac.
关闭您的Mac。
Remove the battery.
取出电池。
Press and hold the power button for five seconds, then re-connect both the battery and the power. Turn on your Mac.
按住电源按钮五秒钟，然后重新连接电池和电源。打开Mac。

Your SMC is now reset.

现在，您的SMC已重置。

在Mac桌面上重置SMC (Resetting SMC on a Mac Desktop)

If you have an iMac, a Mac Mini, or a Mac Pro, resetting the SMC is dead simple:

如果您拥有iMac，Mac Mini或Mac Pro，则重置SMC非常简单：

Shut down your Mac, then unplug the power cable.
关闭您的Mac，然后拔下电源线。
Wait 15 seconds.
等待15秒钟。
Plug the power cord back in, then turn on your Mac.
重新插入电源线，然后打开Mac。

The SMC is now reset.

现在，SMC已重置。

Photo Credits: cdelmoral, Rob DiCaterino

摄影： cdelmoral ， Rob DiCaterino

翻译自: https://www.howtogeek.com/312086/how-and-when-to-reset-the-smc-on-your-mac/