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Check display support
You can connect one or more external displays depending on your Mac model. To find out how many external displays your Mac supports, check its technical specifications:
- Choose Apple menu > About This Mac.
- Click the Support tab.
- Click Specifications.
- On the webpage that appears, the number of displays your Mac supports appears under Video Support or Graphics.
If you're using a Mac with Apple silicon, you can connect a single external display to your Mac using one of the Thunderbolt / USB 4 ports. Docks don't increase the number of displays you can connect as an extended desktop. On Mac mini (M1, 2020), you can connect a second display to the HDMI port.
Connect your display
Connect your display to power, then connect your display to your Mac. Check the ports on your Mac to find out whether you need an adapter.
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Change display options
After you connect your display, you can choose to extend your desktop or mirror your displays.
Use extended desktop mode
- Choose Apple menu > System Preferences, then click Displays.
- Click the Arrangement tab.
- Make sure that the Mirror Displays checkbox isn’t selected.
- Arrange your displays to match the setup on your desk. To change the position of a display, drag it to the desired position. A red border appears around the display as it's moved.
- To set a different display as the primary display, drag the menu bar to the other display. The primary display is where your desktop icons and app windows first appear.
Mirror your displays
- Make sure that your external display is turned on and connected to your Mac.
- Choose Apple menu > System Preferences, click Displays, then click the Arrangement tab.
- Make sure that the Mirror Displays checkbox is selected.
Use AirPlay
With Apple TV, you can use your TV as a separate display for your Mac. Learn how to use AirPlay to mirror or extend your Mac display.
Learn more
New updates are being added at the bottom of this story……
Original story (published on December 10, 2020) follows:
The new Apple Mac Mini M1 seems to be giving dual/multi-monitor users a really hard time with a range of display issues which include green tint, pink squares, and random lag.
As a result, there has been a slew of complaints on official Apple forums, Reddit, and MacRumors forums.
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I’m enjoying my Mac mini with the M1 soc but unfortunately connecting two monitors does not work. Upon fresh boot, both monitors display correctly on login screen. However, when logging in, both monitors start flickering. I have to disconnect and reconnect one hdmi cable for displays to work again.
Source
I have 2 displays plugged in:
1x USBC/Thunderbolt3 24inch LG Ultrafine 4k screen (bought through Apple last year)
1x LG 27inch 4k display, plugged in via HDMI.
The issue I am having is that the 27inch display has a really horrible display lag, moving the mouse, dragging windows round the screen and anything I do
Source
As apparent from the above complaints, users seem to be facing a variety of problems but with the exception of one commonality – most of them, if not all, have a dual-monitor setup.
The issues include:
Click to enlarge
1. Pink squares or dots that appear during boot and the first few minutes after logging in. Some have also reported that they only appear on the login page. Changing the wallpaper has helped a couple of users though, for some reason.
2. Weird green tints that may be coupled with static in the display. These too may last for only a few minutes during and after a boot-up. Replugging the HDMI cable makes the problem vanish temporarily.
3. One or both the monitors not working at all. And even if they do, there may be plenty of flickering. Again, replugging the cables solves the issue temporarily. The screen may also go black after a wake-up from sleep mode.
4. Horrible display lag that can be reproduced by simply moving the mouse around or dragging windows.
5. Unsupported 5120×1440 screen resolution. This is not related to multi-monitor setups but is a display issue nonetheless, and hence had to be included here.
Workarounds for dual display issues on Mac Mini M1
While there isn’t much that can be done about the matter apart from waiting for an official acknowledgment from Apple, we still managed to pull out a few workarounds from the forums.
1. Turn separate spaces off: This has reportedly worked for a few users for some reason. You can try your luck by heading over to System Preferences > Mission Control and turning “Separate spaces” off, or turning it on if it’s already off.
2. Make sure that you are using proper cables: You can read all about the supported cable connections here.
talking with senior support today..seems like the culprit is these usb c to HDMI adapters…not supported as of now…however I can make it work by toggling the refresh rate
Source
I was on phone with Apple Support and it said that with 2 monitors we have to use the 2 thunderbolt output, not mixed with hdmi output.
Source
3. Reinstall macOS: Oddly enough, a couple of users reported that a Big Sur re-install fixed the problem for them. This is not recommended though.
If you still want to give it a go, you need to firstly reboot and immediately hold down the Command + R or Command + Option + R keys. Next, click on the “Reinstall macOS” option that appears in the recovery.
Hopefully, Apple addresses the matter and releases a bug fixing update for the same if it truly is software related. For now, be sure to check out our dedicated macOS Big Sur bugs/issues tracker.
06:17 pm (IST): Apple has acknowledged one of the problems given above — the unsupported 5120×1440 screen resolution issue — and is likely to release an update soon to fix it. This is apparent from a new support document:
If you connect an ultrawide or super-ultrawide monitor to your Mac with Apple M1 chip, some resolutions supported by your display may not be available. Apple is aware of this issue and resolution is planned for a future macOS update.
Source
Hopefully, this update will also address the other display issues faced by Mac Mini M1 users as well.
Update 2 (January 22, 2021)
01:14 pm (IST): As per macOS Big Sur 11.2 release notes, Apple has now fixed one of the many display issues plaguing the Mac mini M1 wherein external displays showed a black screen when connected using an HDMI to DVI converter.
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