在您的Mac上安装 macOS Big Sur可让您访问一些新功能(handful of new features)、设计改进和大量系统自定义选项(system customization options)。Big Sur可能是(Big Sur)Apple发布过的最好的操作系统，但它与以前的 macOS 版本有一个共同点：不完美。
没有操作系统是完美的，但Big Sur似乎有大量的错误和问题。不过，这是可以理解的——它是一个相对较新的操作系统。在本文中，我们汇总了许多Mac用户遇到的五个常见Big Sur问题。(Big Sur)您还可以找到几种解决问题的方法。
请注意，虽然Big Sur的一些问题已在后续更新中得到修复，但其他问题仍然存在。事实上，更大的问题可能会在以后出现。然而，对于未修复/现有的问题，我们提供了一些出色的解决方法，帮助遇到类似问题的 其他Big Sur用户。(Big Sur)
1.屏保错误
macOS Big Sur (11.1) 附带一个奇怪的主要错误，该错误会在其他任务中间随机激活并显示屏幕保护程序。(randomly activates and displays the screensaver)您可能正在浏览 Safari(Safari)上的网页，屏幕上会弹出一个屏幕保护程序。发生这种情况时，您将被暂时锁定在Mac之外。点击屏幕什么都不做，敲击键盘上的随机键也是如此。
让您的Mac进入睡眠状态（合上盖子或按Command + Option + Power button）将关闭屏幕保护程序，但只是暂时的。尝试以下建议来阻止屏幕保护程序故障。
禁用快速用户切换(Disable Fast User Switch)
我们应该提到这个错误主要影响具有多个用户帐户的 Mac(Macs with multiple user accounts)。在运行Big Sur的(Big Sur)Mac上创建新用户帐户也可能会产生此问题。
显然，“事实用户切换”功能似乎是造成此错误的原因。在系统(System) 偏好设置(Preferences)中禁用该功能并将其从菜单栏(Menu Bar)和控制中心(Control Center)中删除可以解决此问题。
1. 进入系统偏好设置(System Preferences)>用户和群组(Users & Groups)>登录选项(Login Options)，然后点击左下角的锁形图标。
2. 输入您的 Mac 密码以继续。
3. 取消选中此选项：将快速用户切换菜单显示为(Show fast user switching menu as)。
4. 返回系统偏好设置(System Preferences)并单击Dock & Menu Bar。
5.选择侧边栏上的快速用户(Select Fast User)切换并取消选中这两个选项：在菜单栏中(Show in Menu Bar)显示和在控制中心显示(Show in Control Centre)。
更新您的 Mac（至 Big Sur 11.2）(Update Your Mac (to Big Sur 11.2))
屏幕保护程序中断故障似乎是Big Sur的第一个版本所特有的。操作系统的后续版本（尤其是Big Sur 11.2或更高版本）附带了对该错误的修复。
转到系统偏好设置(System Preferences)>软件更新(Software Update)并检查是否有适用于您的Mac的 macOS Big Sur 11.2 更新。
2. 电池耗尽问题
几位 Mac 用户报告(reported significant battery drainage)升级到 macOS Big Sur后电池电量明显下降。我们还发现一些用户在Mac(Mac)关机或处于睡眠模式时遇到随机电池放电。
在我们列出这些问题的一些解决方案之前，您应该注意，有时，软件更新后电池耗尽是正常的。这是因为在后台运行多个进程以使您的Mac适应新的操作系统。
这些过程消耗大量电力，但仅持续几天。该问题应在大约 2-5 天内自行解决，并且电池使用应恢复正常。如果电池电量在此期间后仍然存在，则 Mac 的电池校准可能存在问题。尝试以下一些方法来解决问题。
重新校准 Mac 的电池(Recalibrate Your Mac’s Battery)
MacBook(MacBooks)会经过校准过程，有助于估计您的电池在当前充电水平下可以使用多长时间。系统更新可能会扰乱 Mac 的校准程序，并导致电池消耗的速度比预期的要快。
要重新校准电池，请使用Mac直到电池完全放电并关闭。等待(Wait)几分钟，然后为您的Mac充电，直到电池充满电（即 100%）。
重置 SMC 和 NVRAM(Reset SMC and NVRAM)
重置Mac的系统管理控制器(System Management Controller)( SMC ) 和NVRAM（非易失性随机存取(Random-access)存储器）有助于阻止 macOS Big Sur电池耗尽问题。要执行NVRAM重置，请关闭Mac并重新打开。一旦Apple标志出现在屏幕上，请按住这些键：Command + Option + P + R R。20 秒后松开所有四个键。
SMC还控制Mac如何管理电源、电池和其他相关功能。重置SMC(SMC)所涉及的过程各不相同，主要取决于Mac使用的处理器类型。有关在 Mac 上重置 SMC 的信息，(this guide on resetting SMC on Mac)请参阅本指南或访问Apple 的支持页面(Apple’s Support page)以了解更多信息。
更新您的应用程序(Update Your Apps)
在新操作系统上运行过时的应用程序可能会影响 Mac 的性能。我们发现，在将应用程序更新到最新版本后，一些用户在Big Sur上不再出现随机电池耗尽的情况。(Big Sur)
启动 App Store，转到更新(Updates)部分，然后单击右上角的全部更新(Update All)。
对于不在App Store上的应用程序，请前往应用程序的设置(’ Settings)菜单或开发者的网站以检查可用更新。
3. Mac未检测到外部显示器(Detecting External Displays)
如果您的Mac在升级到 macOS Big Sur后不再识别您的外接显示器（通过USB-C集线器或适配器） ，或者它不会检测到多个外接显示器，那么您并不孤单。
在这个 Apple 社区线程(this Apple Communities thread)中有成百上千的与外部显示器相关的投诉。一些用户还指出，在Big Sur升级后， Mac并没有将最高分辨率（尤其是 4K）投射到他们的外接显示器上。
目前，即使在Big Sur 11.2上，也没有针对此问题的官方修复。解决USB和显示问题（例如重置SMC和NVRAM ）的(NVRAM)常见(Common)故障排除步骤也不会产生积极的结果。下面的技巧帮助一些Mac用户解决了这个恼人的Big Sur问题。
按住缩放分辨率(Scaled Resolution)选项(Option)
您可以尝试的一个快速解决方法是首先转到System Preferences中的(System Preferences)Display页面。
默认情况下，您会看到分辨率设置为Default for display。如果单击 Scaled，您将获得从Larger Text到More Space的四个选项。从技术上讲，更多空间(Space)应该为您提供显示器可以处理的最高分辨率，但这似乎也不起作用。
但是，您可以通过按住Option(Option)键然后单击Scaled单选按钮来获得一整套分辨率选项。如果已选择Scaled按钮，请首先选择(Scaled)Default 进行显示( Default for display )，然后按Option键，然后再次单击Scaled。
如您所见，我现在可以选择我的Pro XRD显示器支持的完整 6K 分辨率。到目前为止，我一直在 3K 运行。您应该在此处看到您的显示器可以支持的最高分辨率选项。
Thanks to Jorg Brown, a Switching to Mac reader, for sending me this tip!
切换或降级显示器的输入标准(Switch or Downgrade Monitor’s Input Standard)
如果您的 USB-C 适配器同时具有HDMI 2.0和HDMI 1.4端口，将外部显示器连接到后者可能会迫使 macOS 提供最高分辨率。对于DisplayPort连接，请尝试将显示器的输入从(DisplayPort)DisplayPort 1.4降级到DisplayPort 1.2 。
macOS Big Sur(Big Sur)似乎与这些显示标准的最新版本不完全兼容。因此(Hence)，您的Mac无法检测到UW-QHD (3440 x 1440p ) 和 4K 分辨率的外部显示器或项目内容的原因。
对于USB-C显示器，请尝试将电缆切换到USB 2.0端口。这对某些用户来说很神奇，所以尝试一下并检查您的Mac现在是否检测到显示器的原始分辨率。如果问题仍然存在，请重新启动Mac 并重(Mac)试。
4. AirPods 自动切换问题
借助“自动设备切换”功能，您的AirPods应该会在您的 iCloud 设备之间切换——这取决于哪个设备正在播放音频。在 Big Sur上，AirPods会自动从Mac切换到其他 iCloud 设备（iPhone 或 iPad），但不会切换回Mac。这描述了许多运行 Big Sur 的 Mac 用户的困境(plight of many Mac users running Big Sur)。
这个问题尚未在任何Big Sur更新中得到解决，但一些用户透露退出Apple ID并重新登录解决了这个问题——尽管是暂时的。
转到系统偏好设置(System Preferences)> Apple ID >概述(Overview)，然后单击注销(Sign Out)按钮。
检查列表中的所有 iCloud 数据，然后单击保留副本(Keep a Copy)以继续。
重新连接您的Apple ID并检查您的 AirPods 现在是否从其他 iCloud 设备切换回您的Mac 。
5. Big Sur 印刷问题
更新到Big Sur也可能会破坏Mac的打印功能。许多用户报告说，某些打印机在Big Sur(Big Sur)更新后没有收到来自Mac的输入。(Mac)此问题可能是由于打印机与 macOS 不兼容。因此，我们建议您访问打印机制造商的网站，检查是否有适用于您的打印机的驱动程序更新。
删除打印机并将其重新添加到Mac也可以解决问题。转到系统偏好设置(System Preferences)>打印机和扫描仪(Printers & Scanners)，然后在边栏上选择受影响的打印机。单击减号 (—)(minus (—) sign)并在提示中选择删除打印机。(Delete Printer)
要重新添加打印机，请单击plus (+) sign并继续从列表中选择您的打印机。确保在设置打印机时使用通用 PostScript 打印机选项；(Generic PostScript Printer)这是目前为许多用户解决 Big Sur 打印问题的唯一解决方法。(only workaround that fixed the Big Sur Printing problem)
大苏尔，大虫子
这些是 macOS Big Sur升级的一些“未修复”问题。也有报告称升级到Big Sur(Big Sur)后键盘背光不工作。如果您遇到此问题，请尝试重置 Mac 的系统管理控制器(System Management Controller)。
那应该恢复键盘背光。让我们知道您是否遇到任何这些问题，以及上述任何建议是否为您解决了问题。
The 5 Biggest Problems with Big Sur and How to Fix Them
Installing macOS Βig Sur оn your Mac grants you access to a handful of new features, design improvements, and a bunch of system customization options. Big Sur may be the best operating system ever released by Apple, but there’s one thing it shares in common with previous macOS versions: imperfection.
No operating system is perfect, but Big Sur seems to have an enormous amount of bugs and problems. This is quite understandable, though—it’s a relatively new OS. In this article, we compile five common Big Sur issues encountered by many Mac users. You’ll also find several ways to get the issues fixed.
Note that while some of these problems with Big Sur have been fixed in subsequent updates, others still very much exist. In fact, bigger problems may emerge at a later date. For the unfixed/existing problems, however, we’ve provided some brilliant workaround that helped other Big Sur users experiencing similar problems.
1. Screensaver Bug
The macOS Big Sur (11.1) shipped with a weird major bug that randomly activates and displays the screensaver in the middle of other tasks. You could be scrolling through a webpage on Safari and a screensaver will pop on the screen. When this happens, you’re temporarily locked out of your Mac. Clicking the screen does nothing, so does tapping random keys on the keyboard.
Putting your Mac to sleep (close the lid or press Command + Option + Power button) will dismiss the screensaver, but only temporarily. Try the recommendations below to put a stop to the screensaver glitch.
Disable Fast User Switch
We should mention that this bug majorly affects Macs with multiple user accounts. Creating a new user account on your Mac running Big Sur may also birth this issue.
Apparently, it appears that the “Fact User Switching” feature is responsible for this error. Disabling the feature in System Preferences and removing it from the Menu Bar and Control Center can fix this problem.
1. Go to System Preferences > Users & Groups > Login Options and click the lock icon at the bottom-left corner.
2. Enter your Mac’s password to proceed.
3. Uncheck this option: Show fast user switching menu as.
4. Return to System Preferences and click Dock & Menu Bar.
5. Select Fast User Switching on the sidebar and uncheck these two options: Show in Menu Bar and Show in Control Centre.
Update Your Mac (to Big Sur 11.2)
The screensaver interruption glitch seems to be peculiar to the first build of Big Sur. Subsequent point releases of the operating system—particularly Big Sur 11.2 or newer—ship with fixes to the bug.
Go to System Preferences > Software Update and check if there’s a macOS Big Sur 11.2 update available for your Mac.
2. Battery Drain Issues
Several Mac users reported significant battery drainage after upgrading to macOS Big Sur. We also found a couple of users experiencing random battery discharge when their Mac is powered off or in sleep mode.
Before we list some solutions to these problems, you should note that sometimes, battery drainage is normal after a software update. That’s because several processes run in the background to acclimate your Mac to the new operating system.
These processes consume a lot of power but they only last a couple of days. The issue should resolve itself in about 2-5 days and battery usage should return to normal. If the battery drainage persists beyond this period, there’s probably a problem with your Mac’s battery calibration. Try some of the methods below to fix the problem.
Recalibrate Your Mac’s Battery
MacBooks undergo a calibration process that helps to estimate how long your battery would last on its current charge level. A system update can mess with your Mac’s calibration routine and cause the battery to drain faster than it’s supposed to.
To recalibrate your battery, use your Mac till the battery discharges completely and shut down. Wait for a couple of minutes and charge your Mac till the battery gets a full charge (i.e. 100%).
Reset SMC and NVRAM
Resetting your Mac’s System Management Controller (SMC) and NVRAM (Non-Volatile Random-access memory) can help put a stop to macOS Big Sur battery drainage issues. To perform an NVRAM reset, shut down your Mac and turn it back on. Press and hold these keys as soon as the Apple logo comes up on the screen: Command + Option + P + R. Release all four keys after 20 seconds.
The SMC also controls how your Mac manages power, battery, and other related functionalities. The procedures involved in resetting the SMC vary and mostly depend on the type of processor your Mac uses. Refer to this guide on resetting SMC on Mac or visit Apple’s Support page to learn more.
Update Your Apps
Running outdated applications on a new operating system can affect your Mac’s performance. We found that some users stopped experiencing random battery drainage on Big Sur after updating their applications to the latest versions.
Launch the App Store, go to the Updates section, and click Update All at the top-right corner.
For apps that aren’t on the App Store, head to the apps’ Settings menu or the developer’s website to check for available updates.
3. Mac Not Detecting External Displays
If your Mac no longer recognizes your external monitors (via USB-C hubs or adapters) after upgrading to macOS Big Sur, or it won’t detect more than one external monitor, you’re not alone.
There are hundreds and thousands of external display-related complaints in this Apple Communities thread. Several users also pointed out that Mac doesn’t project the highest resolution (particularly 4K) to their external display after the Big Sur upgrade.
Currently, there’s no official fix for this problem—even on Big Sur 11.2. Common troubleshooting steps for resolving USB and display issues (e.g. resetting the SMC and NVRAM) yield no positive result, either. The tricks below helped some Mac users get around this annoying Big Sur problem.
Hold Down Option on Scaled Resolution
One quick fix you can try is to first head over to the Display page in System Preferences.
By default, you’ll see the resolution is set to Default for display. If you click Scaled, you’ll get four options ranging from Larger Text to More Space. Technically, More Space is supposed to give you the highest resolution your monitor can handle, but this doesn’t seem to work either.
However, you can get a full set of resolution options by pressing and holding the Option key and then clicking on the Scaled radio button. If the Scaled button is already selected, first select Default for display and then press the Option key before clicking on Scaled again.
As you can see, I now have the option for the full 6K resolution that my Pro XRD display supports. Up till now, I was running at 3K. You should see the option here for the highest resolution your monitor can support.
Thanks to Jorg Brown, a Switching to Mac reader, for sending me this tip!
Switch or Downgrade Monitor’s Input Standard
If your USB-C adapter has both HDMI 2.0 and HDMI 1.4 ports, connecting the external display to the latter may force macOS to offer the highest resolution. For DisplayPort connections, try downgrading the monitor’s input to DisplayPort 1.2 from DisplayPort 1.4.
It seems that macOS Big Sur isn’t fully compatible with the newest versions of these display standards. Hence the reason why your Mac won’t detect external displays or project content in UW-QHD (3440 x 1440p) and 4K resolutions.
For USB-C monitors, try switching the cable to a USB 2.0 port. That worked the magic for some users, so try that and check if your Mac now detects the monitor’s native resolution. If the problem persists, restart your Mac and try again.
4. AirPods Auto Switch Issues
With the “Automatic Device Switching” feature, your AirPods should switch between your iCloud devices—depending on which one’s actively playing audio. On Big Sur, AirPods will automatically switch from Mac to other iCloud devices (iPhone or iPad) but won’t switch back to the Mac. This describes the plight of many Mac users running Big Sur.
This issue is yet to be fixed in any Big Sur updates but some users revealed that signing out of Apple ID and signing back in resolved the problem—although temporarily.
Go to System Preferences > Apple ID > Overview and click the Sign Out button.
Check all iCloud data on the list and click Keep a Copy to proceed.
Reconnect your Apple ID and check if your AirPods now switch back to your Mac from other iCloud devices.
5. Big Sur Printing Problems
Updating to Big Sur may also break your Mac’s printing functionality. Many users reported that certain printers received no input from Mac after the Big Sur update. This problem could be due to the printer’s incompatibility with macOS. Therefore, we advise that you visit the printer manufacturer’s website to check if there’s a driver update available for your printer.
Deleting and re-adding the printer to your Mac may also resolve the problem. Go to System Preferences > Printers & Scanners and select the affected printer on the sidebar. Click the minus (—) sign and select Delete Printer on the prompt.
To re-add the printer, click the plus (+) sign and proceed to select your printer from the list. Make sure you use the Generic PostScript Printer option when setting up the printer; that’s currently the only workaround that fixed the Big Sur Printing problem for many users.
Big Sur, Big Bugs
These are some of the “unfixed” problems with the macOS Big Sur upgrade. There are also reports of keyboard backlighting not working after upgrading to Big Sur. If you ever encounter this issue, try resetting your Mac’s System Management Controller.
That should restore the keyboard backlight. Let us know if you’re experiencing any of these issues, and if any of the recommendations above fixed the problem for you.
