To change the refresh rate, you need to go to the Display settings on your Mac by going to System Preferences > Displays where you can manually change the refresh rate. Most external displays run at around 60Hz although some gaming monitors can run at over 100Hz. It seems that in some cases, macOS is trying to run external displays at a refresh rate that it’s not capable of. Change The Refresh Rateįor some reason the refresh rate of some external monitors has been affected by Sonoma, Ventura and Monterey. Most manufacturers are aware of the problem by now and many will roll out fixes or suggest solutions specific to their models. If all else fails, it’s definitely worth contacting the manufacturer of your external display to see whether there is a firmware upgrade or known solution to the problem with Sonoma, Ventura, Monterey and external displays. You can find full instructions how to reset an external display here. Note that resetting the NVRAM doesn’t usually fix this issue as it’s specific to the display settings on your Mac. In some cases, the monitor will reset itself back to a supported resolution or refresh rate but sometimes you’ll have to reset the external monitor manually to get it working again. Sometimes when you change the resolution or refresh rate settings, your external monitor may not support the setting you’ve selected and go black. Once you’ve installed DisplayLink, your monitor should appear in your Mac Display preferences where you can manage the resolution, brightness and other things. It’s important that the dock or hub you are using supports DisplayLink and you can find this out by checking the model online but most Thunderbolt hubs support DisplayLink. If you’re using a Thunderbolt or USB-C dock/hub to connect your monitors to an Intel or M1/M2 Mac, then you may find that downloading and installing the free DisplayLink Manager from Synaptics helps.ĭisplayLink Manager allows you to connect and manage dual monitors on Macs via a hub, including on M1/M2 Macs.Įven if you’re only using one external monitor however, DisplayLink Manager can fix the problem if it’s not being recognized by your Mac. Here then is how to fix external display problems on Intel and M1/M2 Macs including those running Sonoma, Ventura, Monterey and Big Sur. Note that if your external display is being recognized by macOS but you’re just having problems with the resolution on your external display such as text looking blurry or too small especially on 4K or 5K displays, you may find these external display resolution solutions more useful. The display issues have affected both Intel Macs and the latest M1/M2 Macs so it’s not just an issue related to Apple Silicon Macs.Įxternal monitor problems have been an ongoing issue since the release of Big Sur although the 12.1, 12.2, 12.3 and 12.4 updates to Monterey have fixed it for some users, many Sonoma and Ventura users are still struggling with no updates from Apple in sight. However for users that are using just one monitor and have found that it has suddenly stopped working after upgrading to macOS Sonoma, Ventura, Monterey or even Big Sur, these fixes will help. not M1 Pro, M1 Max or M1 Ultra chip Macs), we strongly recommend checking out these workarounds to make dual monitors work with M1 and M2 Macs. If you’re having problems connecting more than one external monitor to a base model M1 or M2 Mac (i.e. Others are experiencing temporary black-outs which come and go, unstable connections, blurry fonts, washed-out fonts, garbled images or screen flickering.įor those that have just bought M1 or M2 Macs and are trying to use more than one external monitor, it’s important to be aware that the base model M1 and M2 chips do not support more than one external monitor so do not recognize dual monitors. In other cases, some monitors are completely blacked-out or not charging the MacBook Pro connected by Thunderbolt or USB-C cables. In the worst cases, some Mac users have found that the external display is not recognized by Sonoma, Ventura or Monterey when connected via USB-C or Thunderbolt.
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