M2 Pro mini only wakes up one monitor

[gusping]

Hi,

Is anyone having issues with their M2 Pro mini not waking up all connected monitors?

I had the issue from time to time with my 2018 i7 mini, but the issue is way more frequent on my new M2 Pro mini. I have to unplug the affected monitor and plug it back in again to work. The issue happens irrespective of connection type. I have tried HDMI, USB-C to DP, USB-C to HDMI and USB-C connections. I was hoping Apple would have fixed the issues that plagued my Intel mini and many others, but I guess not. I had accepted it on my Intel mini as it wasn't too... common, but it makes my M2 Pro mini incredibly frustrating to use.

Thanks

 

[slothinker]

Hi,

Is anyone having issues with their M2 Pro mini not waking up all connected monitors?

I had the issue from time to time with my 2018 i7 mini, but the issue is way more frequent on my new M2 Pro mini. I have to unplug the affected monitor and plug it back in again to work. The issue happens irrespective of connection type. I have tried HDMI, USB-C to DP, USB-C to HDMI and USB-C connections. I was hoping Apple would have fixed the issues that plagued my Intel mini and many others, but I guess not. I had accepted it on my Intel mini as it wasn't too... common, but it makes my M2 Pro mini incredibly frustrating to use.

Thanks

Yes, I installed my M2 Pro mini yesterday. Went smoothly but now periodically on reawakening or restarting am frequently losing connectivity to a 24" LG UltraScan monitor (which worked fine with 2017 iMac after some initial hiccups, as I recall, back in 2017). Also periodically losing connectivity to an external 4GB SSD. In both cases unplugging and replugging has worked.

 

[kwackman]

I've 2 monitors on my M2Pro mini and have had no issues. Both monitors always work as expected. I'm using the HDMI connector on the Mac Mini, and the HDMI connector on Apple's USB-C Digital AV multipart Adapter.

 

[gusping]

Yes, I installed my M2 Pro mini yesterday. Went smoothly but now periodically on reawakening or restarting am frequently losing connectivity to a 24" LG UltraScan monitor (which worked fine with 2017 iMac after some initial hiccups, as I recall, back in 2017). Also periodically losing connectivity to an external 4GB SSD. In both cases unplugging and replugging has worked.

Interesting that your external SSD is also affected. I returned my M2 Pro and will live with my 2018 i7 mini a bit longer.

 

[kirbyrun]

Similar issue with my M2 mini. I have a somewhat junky Dell as my primary monitor and an old Apple Cinema Display as my secondary. Both connected via USB-C.

Most of the time, when I waken the mini from sleep, the Apple display lights up first. Than the Dell. And all is good in the world.

SOMETIMES, though, the Dell wakes up first. When this happens, the Apple display either A) doesn't come up at all or B) comes up in 720p...and all other resolutions are gone from Settings -> Displays! I either have to unplug and plug in the Apple display again or repeatedly sleep the mini until the Apple display gets the point.

There's something weird afoot with the M2 and displays for sure. I also can't get my HDMI port to output to anything but a TV.

 

[gusping]

Similar issue with my M2 mini. I have a somewhat junky Dell as my primary monitor and an old Apple Cinema Display as my secondary. Both connected via USB-C.

Most of the time, when I waken the mini from sleep, the Apple display lights up first. Than the Dell. And all is good in the world.

SOMETIMES, though, the Dell wakes up first. When this happens, the Apple display either A) doesn't come up at all or B) comes up in 720p...and all other resolutions are gone from Settings -> Displays! I either have to unplug and plug in the Apple display again or repeatedly sleep the mini until the Apple display gets the point.

There's something weird afoot with the M2 and displays for sure. I also can't get my HDMI port to output to anything but a TV.

I also have issues on my 2018 mini when one of the displays will wake up but be in 1080p mode or 30hz instead of 60hz. It just seems headless Macs suck with regards to display compatibility.

 

[kirbyrun]

I also have issues on my 2018 mini when one of the displays will wake up but be in 1080p mode or 30hz instead of 60hz. It just seems headless Macs suck with regards to display compatibility.

I...guess I'm glad to know it's not just the new machines...?

But seriously -- thanks for the info!

And also seriously -- WTF, Apple? It's a display! A display YOU made! You made the computer, the display, and the software. This shouldn't be difficult...

 

[slothinker]

Yes, I installed my M2 Pro mini yesterday. Went smoothly but now periodically on reawakening or restarting am frequently losing connectivity to a 24" LG UltraScan monitor (which worked fine with 2017 iMac after some initial hiccups, as I recall, back in 2017). Also periodically losing connectivity to an external 4GB SSD. In both cases unplugging and replugging has worked.

Just to follow up ... I simply swapped USB-C cables connecting the new MacMini Pro to the Mac Studio Monitor and the LG UltraScan a couple of days ago. Haven't had a 'lost monitor' incident since, which is very encouraging.

 

[gusping]

Just to follow up ... I simply swapped USB-C cables connecting the new MacMini Pro to the Mac Studio Monitor and the LG UltraScan a couple of days ago. Haven't had a 'lost monitor' incident since, which is very encouraging.

A few people claim that solves issues, but it doesn't for me and never has, even on my 2018 mini. Maybe I'm just super unlucky.

 

[Jerry_D]

A few people claim that solves issues, but it doesn't for me and never has, even on my 2018 mini. Maybe I'm just super unlucky.

It doesn't solve it for me either.

I have a new Mac Mini M2 Pro connected to two one-year old Dell U2722DE monitors via USB-C cables.

Everything worked as expected for almost a week and then suddenly the monitors would not wake up from sleep. Moving the mouse, keys on the keyboard, swiping on the trackpad, no avail. Forcing the Mac to shut down and restarting it didn't help either.

Both monitors however did come alive when the same Mac was connected to either of them via a HDMI cable, also when connecting a PC using DP cables or my old Mac mini (2012) with a DP and a HDMI cable. After having tried a lot of different approaches, I just switched everything off (actually pulled the common power strip cord out of the wall socket) for about 30 minutes, connected the monitors to the Mac with the USB-C cables as before and restarted everything. Now everything worked fine again!

Another few days went by with everything working fine and then only one of the monitors went dead; the other one continued working fine but the Mac was only detecting that one. Benefitting from my first experience, I again switched everything off, waited for a while and switched it all back on. Again, everything went back to normal.

Since then, every few days, one of the monitors (not always the same one) goes unrecognized and my switching everything off and on again returns the situation to normal.

 

[Sal Collaziano]

Jeez. I might need to wait until if/when this issue ever gets rectified. I have three 27" ASUS monitors that I planned on connecting from HDMI to Thunderbolt but I need my monitors to work when I sit down at my desk...

 

[Think77]

It’s pretty crazy to hear these accounts from mini M2 Pro owners. When I got my mini M1 26 months ago, it was also a complete mess at first. Now it’s “only” a mess when connecting my display via usb-c/thunderbolt - HDMI works flawlessly (so far) after numerous updates to MacOS over the last few years, but of course that limits the setup to one display. So I bought a 38” LG ultrawide with a very high resolution to get the biggest workspace available. But it just doesn’t feel right that Apple is, seemingly, either 1) unaware that there was a problem with the M1 (and to some extend also the 2018 i7), and/or 2) unable to solve the problem on a basic hardware level moving forward in the development process from M1 to M2.

 

[Sal Collaziano]

It’s pretty crazy to hear these accounts from mini M2 Pro owners. When I got my mini M1 26 months ago, it was also a complete mess at first. Now it’s “only” a mess when connecting my display via usb-c/thunderbolt - HDMI works flawlessly (so far) after numerous updates to MacOS over the last few years, but of course that limits the setup to one display. So I bought a 38” LG ultrawide with a very high resolution to get the biggest workspace available. But it just doesn’t feel right that Apple is, seemingly, either 1) unaware that there was a problem with the M1 (and to some extend also the 2018 i7), and/or 2) unable to solve the problem on a basic hardware level moving forward in the development process from M1 to M2.

It's all making me reluctant to buy a new Mini... I currently have 3 27" monitors for my iMac. I wish there were a single ultra-wide solution that could replace my setup.

 

[kiswelrg]

m2 mac mini can't use 4k144hz on LG 27GP95R, and even 1080p 144hz looks very blurry and unuseable, don't know how to solve it.

 

[Jerry_D]

I might have discovered the root cause, at least for my use case. I was using the DDPM (Dell Display and Peripheral Manager - latest version available at the Dell site) that was running in the background. I have killed that app and also removed it from the Open at Login list. Almost two weeks of heavy use later and with both USB+HDMI and USB+USB connections, after many wake-ups from sleep and also a few MacOS restarts, not a single incident! Both monitors worked and woke up as expected.

Then I started the DDPM app again and sure enough, the following morning only one of the monitors woke up while the other required pulling out of the power cord and plugging it back in in order to start working again.

I then uninstalled the DDPM and now two more weeks have passed with everything working fine.

 

[orpheus1120]

m2 mac mini can't use 4k144hz on LG 27GP95R, and even 1080p 144hz looks very blurry and unuseable, don't know how to solve it.

The Mac Mini only support 4k 60hz. Did you read the spec sheet before you buy it?

 

[Jerry_D]

The Mac Mini only support 4k 60hz. Did you read the spec sheet before you buy it?

Mac mini simultaneously supports up to two displays: one display with up to 6K resolution at 60Hz over Thunderbolt and one display with up to 5K resolution at 60Hz over Thunderbolt or 4K resolution at 60Hz over HDMI.

And this post is actually about Mac mini M2 Pro. That one simultaneously supports up to three displays:

• Up to three displays: Two displays with up to 6K resolution at 60Hz over Thunderbolt and one display with up to 4K resolution at 60Hz over HDMI
• Up to two displays: One display with up to 6K resolution at 60Hz over Thunderbolt and one display with up to 4K resolution at 144Hz over HDMI
• One display with up to 8K resolution at 60Hz or 4K resolution at 240Hz over HDMI

 

[fiat]

Mac mini simultaneously supports up to two displays: one display with up to 6K resolution at 60Hz over Thunderbolt and one display with up to 5K resolution at 60Hz over Thunderbolt or 4K resolution at 60Hz over HDMI.

And this post is actually about Mac mini M2 Pro. That one simultaneously supports up to three displays:

• Up to three displays: Two displays with up to 6K resolution at 60Hz over Thunderbolt and one display with up to 4K resolution at 60Hz over HDMI
• Up to two displays: One display with up to 6K resolution at 60Hz over Thunderbolt and one display with up to 4K resolution at 144Hz over HDMI
• One display with up to 8K resolution at 60Hz or 4K resolution at 240Hz over HDMI

Can M2 Pro Mini support ONLY two displays over two Thunderbolt ports with 6k res at 60Hz?

 

[Jerry_D]

Can M2 Pro Mini support ONLY two displays over two Thunderbolt ports with 6k res at 60Hz?

I think so (haven't tested it). That's how I read the first bullet point:

• Up to three displays: Two displays with up to 6K resolution at 60Hz over Thunderbolt and one display with up to 4K resolution at 60Hz over HDMI

Any subset of the three items mentioned there should work.

 

[zgagato]

I have a m2 Pro mini and 2 Dell 24" monitors: U2518D and U2515h. Both are waking up from sleep, everything works fine. But the newer one is jreated by the mini as a secondary monitor. I have it connected with hdmi to the mini, the older one with dp through caldigit dock. It is treated as primary. the options menu comes up on the older one always.

My client also bought the same mini but stock pro with 1 tb ssd. His old 27 " Dell doesn’t want to wake from sleep.

 

[Hicksrules]

Hi,

Is anyone having issues with their M2 Pro mini not waking up all connected monitors?

I had the issue from time to time with my 2018 i7 mini, but the issue is way more frequent on my new M2 Pro mini. I have to unplug the affected monitor and plug it back in again to work. The issue happens irrespective of connection type. I have tried HDMI, USB-C to DP, USB-C to HDMI and USB-C connections. I was hoping Apple would have fixed the issues that plagued my Intel mini and many others, but I guess not. I had accepted it on my Intel mini as it wasn't too... common, but it makes my M2 Pro mini incredibly frustrating to use.

Thanks

Hi there.

I think i finally figured it out. I have been having the same dual monitor problem for a while now. I have a brand new Mac mini M2 with two Samsung LF24T450F displays. One is hooked directly by HDMI and one via USB C to HDMI.

I have tried all the various solutions (the direct HDMI and one via USB C was one of them ) to solve this problem but none of them worked. Only one display would wake up (the one hooked by direct HDMI) whilst for the other I would have to unplug it and plug it back in (which is a pain because the USBC display is my primary one and every time i do this the MAC switches it to extended).

Today I stumbled upon the solution by accident. My Samsungs go to sleep after 10 minutes. I normally push the button to wake them up at the same time i wake up the computer. DO NOT DO THAT. First wake up the display (both of them) THEN wake up your mac mini. Both displays came on no problem.

I have verified this method by putting my mac to sleep, going for a coffee and coming back. Turned displays on then mac.. both came back on no problem.

 

[Fishrrman]

Hicks wrote:
"I normally push the button to wake them up at the same time i wake up the computer. DO NOT DO THAT. First wake up the display (both of them) THEN wake up your mac mini."

Could you clarify a couple of things for an ol' dummy like me?

Which "button" are you referring to? That would normally be used to "wake up" the Mac, but should NOT be "pushed" in this instance?

And ... how do you "wake up" the displays?
What do you touch... or click, or...?

 

[Hicksrules]

Hicks wrote:
"I normally push the button to wake them up at the same time i wake up the computer. DO NOT DO THAT. First wake up the display (both of them) THEN wake up your mac mini."

Could you clarify a couple of things for an ol' dummy like me?

Which "button" are you referring to? That would normally be used to "wake up" the Mac, but should NOT be "pushed" in this instance?

And ... how do you "wake up" the displays?
What do you touch... or click, or...?

The Samsung displays have buttons to wake them up (same button that turns them on and off actually). When the displays remain inactive for more than 30 minutes they automatically go to power saving mode. If you now press those buttons to wake up the screens you will see the message that the screens are searching for an input signal. If you now wake up the mac both screens become active (after a second or so) as they receive a signal from the computer.

Hope this helps

 

[bosconi]

Mac Studio M2 Ultra, two LG 4K monitors, no dock, Apple wireless keyboard, mouse and trackpad. One monitor will wake up, the other will not.

WORKAROUND: If I manually wake up the monitor that doesn't wake up, before waking the Mac, everything is fine. I just touch the one control button this LG monitor has in order to wake it.

We really shouldn't have to do this sort of thing, but it seems to suggest that Apple is making an incorrect assumption about how quickly they can poll a monitor for its information after resuming the video signal to it.