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Ric Ford

MacInTouch
Apple could design a cooling system for the 2018 Mini which allows all six i7 or i5 cores to run at their full Turbo speeds at, say, 80°C. That's a simple engineering task, but of course that would result in a much larger case to house the much larger cooling unit. Apple is under no obligation to do that, much like Dell is under no obligation to do the same in their tiny Optiplex 7060 USFF units.
...
In my opinion, the takeaway here is that recent Intel design changes have enabled significantly higher maximum clock speeds when in Turbo mode and also allow more power usage than the CPU is rated for. While you will see those benefits in shorter-term jobs, you will not see nearly as much with longer jobs in the typical smaller chassis computers, which are in vogue nowadays. Performance running at stock non-turbo speeds is unaffected by this and continues to work as advertised.
A related note from Apple:
Apple Support said:
If kernel_task is using a large percentage of your Mac CPU
Activity Monitor might show that a system process named kernel_task is using a large percentage of your CPU, and during this time you might notice more fan activity.

One of the functions of kernel_task is to help manage CPU temperature by making the CPU less available to processes that are using it intensely. In other words, kernel_task responds to conditions that cause your CPU to become too hot, even if your Mac doesn't feel hot to you. It does not itself cause those conditions. When the CPU temperature decreases, kernel_task automatically reduces its activity.
 



As an SSD optimization, I have disabled Sleep Image using Disk Sensei's Tools options, not so much to save space on the SSD but to reduce wear and wake time:
I don't have Disk Sensei. Is there a way to disable this Sleep Image using the Terminal? My new (2018) Mini also has the 30-second wake-from-sleep issue. I wonder if that might help?
 



I don't have Disk Sensei. Is there a way to disable this Sleep Image using the Terminal? My new (2018) Mini also has the 30-second wake-from-sleep issue. I wonder if that might help?
Under Sierra or later, you need to disable SIP, then do a:
Code:
sudo pmset -a hibernatemode 0
and finally reenable SIP (unless you like walking on the wild side)....
 


What do I lose by not having a discrete graphics card, compared to the ATI Radeon HD 2600 xt 256MB that I have in my tower?
 


What do I lose by not having a discrete graphics card, compared to the ATI Radeon HD 2600 xt 256 MB that I have in my tower?
While it would be better if you could compare some test applications, it's worth looking at the results at the TechPowerUp site for the Radeon HD 2600 xt and the Intel UHD Graphics 630. All in all, the specs for everything except the GPU clock are better for the UHD, and the power draw is a third of what the Radeon draws. Probably not too surprising that integrated graphics could be a bit better than a nice discrete card from 12 years ago.
 


Speaking of startup delays...

2018 Mac Minis have been having issues, especially if FileVault is on, when booting — they don’t wake up certain monitors, particularly 4K monitors. Doesn’t matter what connection you have, what cable you use — you have to reboot into Recovery mode, clear PRAM, etc. What's more, some people have found that the machines will “lose” their monitors during sleep.

Remember, these are computers that can run into the thousands of dollars, connected to mildly-to-wildly expensive monitors... and that we paid hundreds of dollars extra for “Apple reliability and support,” neither of which is in evidence. To get problems and to get ignored by Apple like this, I could have set up a hackintosh at much lower cost...

My final proposed solutions were removed from the Apple discussion site.


Apparently they don’t care when we have problems, but they do care when we mention lawyers!

I believe the only fix is for all of us to file bug reports / product feedback with Apple and hope they go back to caring about their buyers (fat chance). I would also suggest that we have the start of a class action suit, really... these computers are not performing their function as advertised. What's more, I understand from discussions elsewhere that they don't work consistently with the eGPU.

In short, if you want a problem solved, you can file as many feedback forms as you like and talk yourself hoarse in the Apple Communities, and Apple won’t hear you. Mention the word “class action” and you’re immediately nabbed. I'm just glad it's not a permanent ban.
 


2018 Mac Minis have been having issues, especially if FileVault is on, when booting — they don’t wake up certain monitors, particularly 4K monitors. Doesn’t matter what connection you have, what cable you use — you have to reboot into Recovery mode, clear PRAM, etc. What's more, some people have found that the machines will “lose” their monitors during sleep.
I notice most monitors mentioned on the Apple forum are from LG. Are other monitors working for other people? Is it just 4K or are people also having problems with 2K monitors? It sounds like the blank screens may happen only in certain cases with certain types of cables, which can be a hard thing to troubleshoot.
 


I notice most monitors mentioned on the Apple forum are from LG. Are other monitors working for other people? Is it just 4K or are people also having problems with 2K monitors? It sounds like the blank screens may happen only in certain cases with certain types of cables, which can be a hard thing to troubleshoot.
I've used three HDMI cables, two DisplayPort cables/adapters (though apparently DisplayPort is a “known issue”), and a couple of USB-C-to-HDMI adapters.

Pretty sure this is not cables. It also only happens to me, at least, in the FileVault unlock screen. The way around that is to boot into recovery mode, which, unfortunately, seems to void the 32-bit-warning database file, so I get warned about every freakin’ program I use again.

Reminds me of the time I tried to update my Mac Pro 5,1 to Mojave, and was then told that it won't support FileVault. Thanks, Apple.
 


Ric Ford

MacInTouch
I notice most monitors mentioned on the Apple forum are from LG. Are other monitors working for other people? Is it just 4K or are people also having problems with 2K monitors?
I had to stop using my 27" LG 4K monitor in retina mode with my 2015 MacBook Pro 15" running macOS Sierra, because it was causing memory/drive corruption. Not cool.

I switched to a Viewsonic 27" VP2770 at 1440p and it's running fine. (It also ran fine with a 23" Viewsonic at 1080p.)

I haven't had a chance to do further testing to isolate the LG problem, but I did do some experiments removing SwitchResX, which didn't seem to be implicated in the problem. Sleep/wake did seem to be a factor, however, making me wonder about issues with saving/restoring the Sleep Image file used for deep sleep (hibernation), which I had disabled via DIsk Sensei.

Yet to be tested:
  • LG 4K with 2018 MacBook Pro/macOS 10.14
  • LG 4K with 2015 MacBook Pro (test boot drive!) / Sierra vs. Sleep Image
  • LG 4K at 1440p with 2015 MacBook Pro (test boot drive!) / Sierra
 


I don't know if this is relevant: I'm still using an ancient Samsung SyncMaster 712n VGA monitor. I use an HDMI-to-VGA adapter, which has an optional USB cable to supply additional power. The adapter worked on my 2011 Mac Mini without the added power. On my 2018 Mac Mini, the USB power boost is required.
 


Re Mac Mini 2018, FileVault and display issues: before you login to FileVault, it's mostly firmware running things - should be fixable through a firmware update.

I was surprised reading about display issues, because I'd used the new Minis with a wide variety of screens from 22" through 65", sub-1080p to 4k, and a couple of projectors. The only time I'd seen any issues was with three screens connected, where sometimes on reboot one of the displays wasn't recognized - something I was going to further investigate with some different displays within the next couple of days. Sleep/wake cycles didn't seem to have any issues.

One difference is that I run these without FileVault, although I do access boot options fairly often during setup, which is also is entirely firmware-based, and hadn't seen any issues. It's possible that boot options don't even try to do resolutions higher than 1080p.
 



Re Mac Mini 2018, ... The only time I'd seen any issues was with three screens connected, where sometimes on reboot one of the displays wasn't recognized - something I was going to further investigate with some different displays within the next couple of days. ...
Thank you for the information. I had this problem and thought it was the monitor, since it was always the same monitor affected, and changing connection type (VGA, DisplayPort, HDMI) made no difference. FileVault is not in use. I look forward to your investigatory results.
 


I don't have Disk Sensei. Is there a way to disable this Sleep Image using the Terminal? My new (2018) Mini also has the 30-second wake-from-sleep issue. I wonder if that might help?
So did disabling the sleep image fix the 30-sec. wake from sleep issue? I had that issue with a 2018 Mini and an LG 34WK95U-W, which I later returned.
 


Thank you for the information. I had this problem and thought it was the monitor, since it was always the same monitor affected, and changing connection type (VGA, DisplayPort, HDMI) made no difference. FileVault is not in use. I look forward to your investigatory results.
One more for your collection of info: sometimes I can type in my password “blind,” and it will, after anything from 10 to 90 seconds, light up the screen. Not the whole screen at first, just the progress bar, but then it all shows up...
 


Ric Ford

MacInTouch
Not the whole screen at first, just the progress bar, but then it all shows up.
For what it's worth, this is similar to what I see when I boot the 2015 MacBook Pro with an external monitor attached and close the lid as it's booting - the external monitor first shows just the progress bar then finally the whole screen.
 


I get flashing 'interference' on my NEC display when my 2018 Mac goes into sleep mode, even though I am at that time using--and displaying--a completely different computer that happens to be simultaneously plugged into the same NEC monitor.

I have two computers plugged into my NEC MultiSync 2690WUXi monitor: one a 2018 Mac Mini, the other a Lenovo T450S laptop running Debian Linux. Both are connected by DVI ports to the same NEC monitor.

When I am using the Debian machine, if the Mac goes into sleep mode, I see a flashing screen, rendering it completely unusable.

My workaround is to reach over and click the mouse of the Mac and wake it up, without actually switching to the Mac on the monitor. This fixes the screen flashing.

I have never before had an issue where any Mac can ever affect the display of a different computer being actively used and simultaneously plugged into this NEC monitor.

It is such a weird problem that it is difficult to communicate to Apple or NEC support, and impossible to come up with a combination of search terms to find if anyone else is having this problem.
 


Re: 2018 Mac Minis not waking the display after waking from sleep, add me to the list of people having this issue. My 2018 Mini is connected to a 1080p Sharp TV via an AV receiver. With this configuration, the previous Mini's display appeared on the TV in a few seconds after waking it from sleep every time. (That is a mid-2009 Mini, connected via a DVI -> HDMI adapter.)

With the 2018 Mini, the display sometimes appears on the TV in a few seconds, other times 30 seconds, other times 120 seconds. There's no pattern to this. I usually get impatient and switch the AV receiver to a different input, then switch it back to the Mini, which sometimes causes the display to appear, although even this is inconsistent.

For a long time, I thought it was something to do with routing the HDMI signal through the AV receiver to the TV (perhaps HDCP, although the receiver supports HDCP). However, judging by the numerous reports from 2018 Mini owners with displays directly connected who also experience protracted times for the display to "wake up", it appears to be the Mini itself that is at fault.

Hopefully a firmware update is coming soon. Released almost 5 months ago, Apple are taking their sweet time to fix this frustrating problem.
 



Early days yet, but the macOS 10.14.4 update appears to have fixed the [2018 Mac Mini] video. I even get Verbose mode working now. This also explains the mystery as to why entering my password “blind” rarely worked — it’s freakin’ slow to respond, so it's basically right-arrow to pick the identity, wait three seconds, slowly type in the password, wait three seconds, hit Enter/Return, wait...

(I thought it was funny, by the way, that a competing Mac-focused web site praised the LG 34-inch 4K monitor to high heaven as the Mac monitor to get... when of course that's one of the ones that wouldn't work, until now, with a Mini!)
 


The new macOS 10.14.4 update released yesterday (25th March) includes:
  • Fixes a graphics compatibility issue that may occur on some external displays connected to a Mac mini (2018)
  • Improves the reliability of USB audio devices when used with the MacBook Air, MacBook Pro and Mac mini models introduced in 2018
I will admit I feel a little foolish for the strength of my complaints... apparently Apple did hear us! The USB audio thing was quite annoying, but I'd been assuming it was a problem with my USB hub!
Early days yet, but the macOS 10.14.4 update appears to have fixed the [2018 Mac Mini] video. I even get Verbose mode working now. This also explains the mystery as to why entering my password “blind” rarely worked — it’s freakin’ slow to respond, so it's basically right-arrow to pick the identity, wait three seconds, slowly type in the password, wait three seconds, hit Enter/Return, wait...
Oops. Earlier I reported that this fixed my problem. In fact, after leaving the computer off overnight, it still will not wake up my LG monitor. Unfortunately, it's too late for a refund on either machine.
 


Ric Ford

MacInTouch
Oops. Earlier I reported that this fixed my problem. In fact, after leaving the computer off overnight, it still will not wake up my LG monitor.
I believe that there are other problems with sleep/wake. I've encountered random (not consistent) problems waking from sleep with macOS Sierra and a 2015 MacBook Pro.

One thing you can try is disabling Sleep Image/Deep Sleep (e.g. via Disk Sensei's Optimize feature or via terminal commands) to see if that might help.

Apple also has a related support document, so you might want to try its suggestions, too:
Apple said:
If your Mac doesn't sleep or wake when expected
...
If your Mac doesn't wake when you expect
Your Mac might pause a few seconds before it wakes up. If it doesn't seem to wake at all, check for these possibilities:
  • Your screen brightness might be turned down.
  • If you're using an external display, your display might be turned off.
  • Your Mac might be in safe sleep. To wake from safe sleep, press the power button.
  • Check for a sleep indicator light, if applicable, and make sure that your Mac isn't turned off.

If the previous steps don't work
These additional steps may help identify or resolve the issue:
  • Reset the SMC.
  • Reset NVRAM.
  • Disconnect external devices other than your Apple keyboard, mouse, and display. If that resolves the issue, gradually reconnect your devices, testing each time, until you find the device that is interfering with sleep. Then check the documentation that came with the device, or contact the device manufacturer.
  • Start up in Safe Mode to see if the issue is related to non-Apple startup items, login items, or kernel extensions.
  • Try to isolate the issue by using another user account.
If you still see the issue, contact Apple Support.
 


At the beginning of the year I bought a Mac Mini. As I have for years, I backed up my Macs daily using SuperDuper. Recently, I want to check a file using the clone created by SuperDuper. I restarted the Mac and held down the option key and waited for the Startup Manager to appear. It never did. It went straight to boot on the internal Mac Mini volume. I tried resetting the SMC and erasing the drive that contained the clone and tried again. No good. Earlier, when I had another bootable volume connected, it didn't show up either. I cannot invoke the Startup Manager.

Has anyone encountered this situation? How did you solve it?
 


Ric Ford

MacInTouch
At the beginning of the year I bought a Mac Mini. As I have for years, I backed up my Macs daily using SuperDuper. Recently, I want to check a file using the clone created by SuperDuper. I restarted the Mac and held down the option key and waited for the Startup Manager to appear. It never did. It went straight to boot on the internal Mac Mini volume. I tried resetting the SMC and erasing the drive that contained the clone and tried again. No good. Earlier, when I had another bootable volume connected, it didn't show up either. I cannot invoke the Startup Manager. Has anyone encountered this situation? How did you solve it?
The 2018 Mac Mini has a new security system, based on its special T2 security processor and micro-OS. Here's an Apple support article about restrictions and overrides, including external boot:
Apple said:
About Startup Security Utility
Available only on Mac computers that have the Apple T2 Security Chip, Startup Security Utility offers three features to help secure your Mac against unauthorized access: Firmware password protection, Secure Boot, and External Boot.
...
External Boot
Use this feature to control whether your Mac can start up from an external hard drive, thumb drive, or other external media.* The default and most secure setting is ”Disallow booting from external media.” When this setting is selected, your Mac can't be made to start up from any external media.
 


The 2018 Mac Mini has a new security system, based on its special T2 security processor and micro-OS. Here's an Apple support article about restrictions and overrides, including external boot:
My trouble was that I couldn't invoke the Recovery Mode. Holding down Command-R at startup didn't bring up the Recovery screen. I was ready to reinstall the OS this morning, but I decided to give it one more try. This time I did not hold down Command-R until the Apple logo appeared, and I held it down until the Recovery screen appeared. All is fine.

Apple is to be faulted. I think that with this new security system, anyone attempting to do an Option key startup, when the default setting is on, should be presented with a message that the computer is currently on its most secure setting and must be changed to permit its operation using other volumes. For example, I had been backing up my Mini daily using SuperDuper. If the internal drive on my Mini had gone south, I would have no way to use the backed up clone. I would have to start over with three months of work lost.
 


For example, I had been backing up my Mini daily using SuperDuper. If the internal drive on my Mini had gone south, I would have no way to use the backed up clone. I would have to start over with three months of work lost.
I can't speak with certainty, but wouldn't you have been able to set up a new/repaired computer using Migration Assistant? I would think you could do an install on a new drive and then use Migration Assistant to bring back all your data (and, perhaps, settings) from the clone/backup. That is the process my son-in-law used when his old MacBook Air went south. He doesn't think he lost anything. His migration was from a Time Machine backup, but I would think the process would be the same.
 


After updating a brand-new 2018 Mac Mini from the factory macOS 10.14.3 to macOS 10.14.4, I noticed that Bluetooth was dead. The Preference Pane is gone, the System Report indicates there is no Bluetooth hardware, and all my attempts to resurrect Bluetooth have failed. I have an evening appointment tomorrow at a nearby Apple Store... will keep you posted.
 


The Apple Genii ran a full suite of diagnostic tests and were baffled at the demise of Bluetooth in this new 2018 Mini (3.2GHz i7 / 16GB / 128GB.) They offered to replace the logicboard, but said it would be weeks. I politely declined and instead will return it to Adorama for a refund and have already purchased a replacement Mini...
 


After updating a brand-new 2018 Mac Mini from the factory macOS 10.14.3 to macOS 10.14.4, I noticed that Bluetooth was dead. The Preference Pane is gone, the System Report indicates there is no Bluetooth hardware, and all my attempts to resurrect Bluetooth have failed. I have an evening appointment tomorrow at a nearby Apple Store... will keep you posted.
That sounded really familiar! I purchased my Mac Mini the first day (actually, hour) when it became available, maxed out except for the 1TB SSD and 32 gibibytes of memory. Bluetooth disappeared right after installing either the third or fourth public beta of 10.14.4. On final restart it warned me that there were no bluetooth devices available. I had to connect my keyboard and trackpad to USB to proceed. The Magic Mouse, of course, is useless when connected/charging.

About This Mac > System Report… indeed showed that there was no Bluetooth present. The Bluetooth preference icon is nonexistent in Systems Preferences. I ran hardware diagnostics, SMC reset, PRAM reset, Safe Boot, caches reset … everything that I could think of, including disconnecting all externals possible to still enable a proper boot. Finally, I got on Apple Support and opted for telephone callback. They had me do pretty much all that I tried before and even went into screen sharing. This was over a couple of days, including promoting support levels to the next tier. They finally concluded that it was an hardware issue and booked me an appointment with a local Apple Authorized Service Provider (AASP), which turned out to be a disaster. They were adamant that there was nothing wrong with the Mac because Hardware Diagnostics reported no problems. I ended up pulling the Mac and setting it up again minus bluetooth, meaning my keyboard and trackpad were connected via lightning cables.

It became obvious that I cannot do without a Mac even for a couple of days and decided to purchase a second Mac Mini as temporary replacement. I opted for the base model plus the 500GB SSD and 16 gibibytes of memory. After setting this up in place of the older Mini, I set up an appointment at my local Apple Store Genius bar. It did not take long for them to also find the hardware issue and take it in for service.

After more than a week at the Apple Store I received a call to inform me of the progress of the repair. They said that the logic board was replaced and that Bluetooth is now working. However, after running a “deep” hardware test, they found another issue related to the I/O system. They did not have the part in the store, so they ordered the part and will install and test it as soon as they have the part.

This probably makes sense, because I had been having trouble with my first Mini from the outset. I have two 4-bay Thunderbolt 3 enclosures for a total of eight drives connected. I also have two 4K monitors connected, as well as a couple of USB-C docks and a Blu-ray USB player/burner. I thought that the Mini was simply overloaded, so that a cold boot more often than not failed. I would have to turn off at least the two-drive enclosures in order to get a successful boot.

What surprised me was that the new Mini, with a slower CPU, less RAM, and smaller internal drive, boots up just fine when fully loaded. My hope is that with this last repair, that issue will be finally fixed. I shall update this post when I get the original Mac Mini back and running.
 


Interesting. (Isn't the LG 4K monitor the one that Apple is selling?) But if not, why not? And what would you recommend?
If I remember correctly, there have been problems with the display remaining asleep or powered off after the Mini wakes from sleep.

If you don't let your Mac sleep (e.g. it's on 24x7 as a server or powered off when not used), then this shouldn't be an issue. I haven't heard similar reports regarding other 4K monitors, so you can probably use any other model if you let your Mac sleep.
 


If I remember correctly, there have been problems with the display remaining asleep or powered off after the Mini wakes from sleep.

If you don't let your Mac sleep (e.g. it's on 24x7 as a server or powered off when not used), then this shouldn't be an issue. I haven't heard similar reports regarding other 4K monitors, so you can probably use any other model if you let your Mac sleep.
Some people (like me) have no sleep issues, but the monitor will not activate when you start the computer. It works if you reset PRAM first or go to Recovery mode. Oddly, this happens even if you have dual monitors and the second one works fine with the Mini (but is older and smaller).

Discussions on Apple's forums yield many people with various issues:

2018 Mac Mini - monitor problems - Apple Community
Mac Mini 2018 screen doesn't wake fro… - Apple Community
Mac Mini Display Wake Up Delay or Never - Apple Community

The monitor models listed include LG 24UD58/24UD58-B/24UD58BAEU, LG34WK95U, LG 27UK650-W, LG43UK6090PUA, and LG 27UK850 (including -W).

One person had an issue with an NEC PA271Q and another with an AlienWare AW3418DW, but other monitors seem to be fine. (Oh, yes, one more case with dual Sceptres, and a couple with Apple Cinema Displays which seem to be more likely the cables.)

The problem does not seem to affect some people if they disable FileVault.

One addition: my trusty Sceptre worked when hooked up to HDMI directly, but not when hooked up to a USB-C-to-HDMI adapter. It does work once the computer is running, but I have to reset PRAM or go into recovery mode or "did you forget your password" mode to get there.
 


Some people (like me) have no sleep issues, but the monitor will not activate when you start the computer. It works if you reset PRAM first or go to Recovery mode. Oddly, this happens even if you have dual monitors and the second one works fine with the Mini (but is older and smaller).

Discussions on Apple's forums yield many people with various issues:

2018 Mac Mini - monitor problems - Apple Community
Mac Mini 2018 screen doesn't wake fro… - Apple Community
Mac Mini Display Wake Up Delay or Never - Apple Community

The monitor models listed include LG 24UD58/24UD58-B/24UD58BAEU, LG34WK95U, LG 27UK650-W, LG43UK6090PUA, and LG 27UK850 (including -W).

One person had an issue with an NEC PA271Q and another with an AlienWare AW3418DW, but other monitors seem to be fine. (Oh, yes, one more case with dual Sceptres, and a couple with Apple Cinema Displays which seem to be more likely the cables.)

The problem does not seem to affect some people if they disable FileVault.

One addition: my trusty Sceptre worked when hooked up to HDMI directly, but not when hooked up to a USB-C-to-HDMI adapter. It does work once the computer is running, but I have to reset PRAM or go into recovery mode or "did you forget your password" mode to get there.
I use an Asus 37" monitor connected via HDMI from my 2018 Mac Mini to the monitor, and, like clockwork, I can expect to have a garbled screen - if anything at all - when waking the Mini from sleep.
 


Ric Ford

MacInTouch
I think, for most workflows, the Mini 8,1 is more than fast enough. Just don't pair it with an LG 4K monitor.
Not just LG monitors but also reports of problems with AOC, Viewsonic (VG2436), Dell (U2312HM), NEC PA271Q, Acer, HPZ30, Apple 30-inch Cinema, and Samsung monitors. Sure looks like an Apple problem to me (not an LG problem), especially considering reports that the same monitors work fine on other computers. Plus this:
Apple Communities said:
2018 Mac Mini - monitor problems
It's a known issue being investigated by Apple's engineers. No known fix at the moment.
Actually, that looks pretty well confirmed now:
Apple said:
macOS 10.14.4
Fixes a graphics compatibility issue that may occur on some external displays connected to Mac mini (2018).
You might owe LG an apology for trying to blame Apple's bug on them in so many posts...

But let us know if Apple's update actually fixes the bug for you (there seems to be some debate about its effectiveness).
 


Ric Ford

MacInTouch
Well, this confirms some suspicions I've had about Apple Thunderbolt reliability...
OWC said:
Envoy Pro EX
Mac mini (2018) Users ONLY: Bus-powered Thunderbolt 3 solutions like the Envoy Pro EX may experience intermittent disconnects when attached directly to one of the Thunderbolt 3 ports on the Mac mini. To avoid this issue, we recommend connecting your Envoy Pro EX through another wall-powered Thunderbolt 3 device in a daisy-chain. These intermittent disconnects only occur when connected directly to the Mac mini (2018) and are not seen on other computer models. This issue has been reported to Apple for resolution.
Lloyd Chambers/diglloyd said:
2018 Mac mini has Thunderbolt 3 Compatibility Issues
Readers might remember that in my review of the 2018 Mac mini I noted some display syncing issues with NEC displays. While I’m no longer having issues and 10.14.4 seems to have helped (unclear if all issues resolved for all users), it seems that Thunderbolt 3 is flawed on the 2018 Mac mini.
 


Not just LG monitors but also reports of problems with AOC, Viewsonic (VG2436), Dell (U2312HM), NEC PA271Q, Acer, HPZ30, Apple 30-inch Cinema, and Samsung monitors. Sure looks like an Apple problem to me (not an LG problem), especially considering reports that the same monitors work fine on other computers. Plus this:
Apple Communities said:
2018 Mac Mini - monitor problems
It's a known issue being investigated by Apple's engineers. No known fix at the moment.
Actually, that looks pretty well confirmed now:
Apple said:
macOS 10.14.4
Fixes a graphics compatibility issue that may occur on some external displays connected to Mac mini (2018).
You might owe LG an apology for trying to blame Apple's bug on them in so many posts... But let us know if Apple's update actually fixes the bug for you (there seems to be some debate about its effectiveness).
I've just purchased a 2018 Mac Mini (i3 model, macOS 10.14.5), and I have the 'wake from sleep' display problem with an HP 2211x monitor attached via HDMI with an Apple HDMI-DVI adapter. Rebooting via a hard reset doesn't fix the issue, but unplugging/plugging the HDMI adapter does after rebooting (which is not an acceptable solution). An SMC reset didn't fix it.

Interestingly, my monitor reports 'no signal' on the DVI line when attempting to awake. If I power-cycle the monitor with the computer awake, I'm met with static on the screen, which doesn't resolve itself unless the HDMI adapter is reconnected. So, it seems like an HDMI handshaking problem to my inexpert eye.

I've ordered a USB-C/DVI cable to see if this will provide an acceptable workaround. But still, this is disappointing from Apple.
 


I've just purchased a 2018 Mac Mini (i3 model, macOS 10.14.5), and I have the 'wake from sleep' display problem with an HP 2211x monitor attached via HDMI with an Apple HDMI-DVI adapter. Rebooting via a hard reset doesn't fix the issue, but unplugging/plugging the HDMI adapter does after rebooting (which is not an acceptable solution). An SMC reset didn't fix it.
Interestingly, my monitor reports 'no signal' on the DVI line when attempting to awake. If I power-cycle the monitor with the computer awake, I'm met with static on the screen, which doesn't resolve itself unless the HDMI adapter is reconnected. So, it seems like an HDMI handshaking problem to my inexpert eye.
I've ordered a USB-C/DVI cable to see if this will provide an acceptable workaround. But still, this is disappointing from Apple.
I had set up a few Mac Minis for clients (and one for myself) with HP's 34" 1440p display from a few years ago (don't remember the HP model number; the Minis were from around 2014, if I recall correctly). In all cases, the HDMI-HDMI connection didn't work consistently; often, the screens wouldn't "see" the video signal from the Minis at boot.

Luckily, these displays also had DisplayPort, so a cheap Mini DisplayPort-to-DisplayPort cable (from Monoprice, if I recall correctly) fixed things 100%.
 


Luckily, these displays also had DisplayPort, so a cheap Mini DisplayPort-to-DisplayPort cable (from Monoprice, if I recall correctly) fixed things 100%.
I'm limited to DVI or VGA on the HP2211x, unfortunately. I should add that the waking problem only arises after the Mac Mini (or monitor?) has been asleep for an extended period of time, such as overnight.
 


I've just purchased a 2018 Mac Mini (i3 model, macOS 10.14.5), and I have the 'wake from sleep' display problem with an HP 2211x monitor attached via HDMI with an Apple HDMI-DVI adapter. Rebooting via a hard reset doesn't fix the issue, but unplugging/plugging the HDMI adapter does after rebooting (which is not an acceptable solution). An SMC reset didn't fix it.
Interestingly, my monitor reports 'no signal' on the DVI line when attempting to awake. If I power-cycle the monitor with the computer awake, I'm met with static on the screen, which doesn't resolve itself unless the HDMI adapter is reconnected. So, it seems like an HDMI handshaking problem to my inexpert eye.
I've ordered a USB-C/DVI cable to see if this will provide an acceptable workaround. But still, this is disappointing from Apple.
I have the 2018 Mac Mini with the 3.2GHz Intel Core i7, 32 gigs of RAM, and two LG 4K monitors (LG 27UK850-W and LG 32UD60-B), one connected to a USB-C port of the Mini (by a USB-C to DisplayPort cable) and the other by DisplayPort to one of my two Akitio Thunder3 Quad X enclosures.

I routinely log out at the end of the day, and occasionally, I’d say about 10 to 15% of the time, the monitors do not come to life the next morning. Well, they do in a way, because they power up and you can hear the beeps but remain dark. Normally, after several tries, I would have to force the Mini to shut down and reboot, at which time I do get a normal startup.

Then this morning, the same thing happened. After a few tries, waking the Mac up from the keyboard, you could hear activity from the hard drives in the enclosures. So I tried going through the motion of logging in, blind, and when it seemed like I was logged in, pressed control-eject on the keyboard to invoke the shutdown/restart dialog window, pressed enter (shutdown), and sure enough, it did a shut down. I then performed an SMC reset and afterwards rebooted from the power button and everything came back up to life.

I’m wondering if the problem lies with the built-in Intel 630 graphics, and if an eGPU would help. I would not require a high-end graphics card, since the most demanding video work I do is Photoshop, and no games.
 


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