New updates are being added at the bottom of this story……

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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.

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As a result, there has been a slew of complaints on official Apple forums, Reddit, and MacRumors forums.

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

CNET Download provides free downloads for Windows, Mac, iOS and Android devices across all categories of software and apps, including security, utilities, games, video and browsers. “This tool is a very good piece of software, I would choose to use this option when reading short bursts of text as it is also easy to set up and easy to constantly accessible, the idea of having the ruler size adjustable is very good, the option to change the ruler (and the area outside the ruler) colour and density is handy as it really does help me focus and take in the written.

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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Blue light blocking apps can help promote better sleep after screen-time [icon name=”clock-o” class=”” unprefixed_class=””]

Televisions and mobile phones are likely to emit blue and yellow lights that are considered by medical experts to be harmful to the eyes and overall eye health.

Blue light that radiates from such devices is likely to suppress natural mechanism which helps people to fall asleep during the night.

However, blocking blue wavelength is likely to help restore normal sleep at night time, as revealed by studies.

Teenagers using computers and various types of digital devices when using apps like Iris software are found to be much more relaxed when using these devices at night for a good amount of time.

They also get sleepy during bedtime which is essential for better health.

Effects of screen light [icon name=”laptop” class=”” unprefixed_class=””]

LED screens are being used widely in smart phones, computer monitors, TVs and tablets.

Screen light tends to affect the circadian physiology, which is quite high in these devices and are used very close to the eyes.

Viewing these screens during evening time will only make the teenagers be awake at night and not get good quality sleep.

This is because, it tends to involve light exposure, specifically in the blue wavelength range.

There is where the biological clock, as well as its related arousal promotion, is known to its greatest sensitivity.

Viewing computer or phone screens when in bed is linked to insomnia.

It can become difficult to wake up the next morning according to studies.

The reason is that light tends to impact the circadian rhythms along with the sleep-wake cycles.

Using yellow filter for computer screen will prove to be more than beneficial for the eyes and overall health.

Why blue light is harmful? [icon name=”lightbulb-o” class=”” unprefixed_class=””]

Teenagers are already found to stay awake for late hours.

As a result, requiring to wake up very early for studies is likely to develop a chronic sleep debt.

As a result, this affects sharply the teens’ focus and moods.

The LED light screens, as suggested by Wikipedia, do emit short wavelength light. I

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