10.15.5 wake issues

[JJ71]

On my 2018 Mac mini with this latest update, I'm now having an issue where one of my monitors doesn't wake up after sleep.... I just get a black screen. I have to turn it on and off to get an image. It's a dell ultrasharp connected by Mini DisplayPort. My second monitor (also dell ultrasharp) connected by HDMI doesn't seem to have the issue. This all started immediately after applying 10.15.5.

Is anyone else seeing issues like this? Any suggestions on troubleshooting, etc?

 

[0128672]

That sounds pretty frustrating. FWIW I have a Dell Ultrasharp (U2718Q) connected via DisplayPort to my 2018 Mac Mini and am not having any wake from sleep issues after the 10.15.5 upgrade. If it was me, I'd swap the connections to see if I could reproduce it on the other display.

 

[JJ71]

My machine is tied up for the next 6 hours or so (doing some TiVo maintenance/copies with VMware fusion). But after that's done I'm planning to apply the combo update to make sure nothing went wrong. And I also plan to turn everything completely off and on afterwards to see if that sorts it out.

 

[tommiy]

There is a very long thread on apple communities on this topic that started with .4. Looking yesterday there are reports of nothing being fixed. Apparently the only fix is after being connected for 30+ minutes it may start working.

 

[JJ71]

It's weird for me because I had no issues until 10.15.5. I did do the combo update today and power-cycled everything. But my monitors and even usb keyboard (having to unplug it and plug it back in to work) seem to be acting weird now...

 

[Taz Mangus]

It's weird for me because I had no issues until 10.15.5. I did do the combo update today and power-cycled everything. But my monitors and even usb keyboard (having to unplug it and plug it back in to work) seem to be acting weird now...

Try a SMC reset and see if that helps.

Reset the SMC of your Mac - Apple Support

The SMC is responsible for managing power on your Mac. Resetting it can resolve certain uncommon issues related to power or thermal management.

support.apple.com

 

[JJ71]

Try a SMC reset and see if that helps.

Reset the SMC of your Mac - Apple Support

The SMC is responsible for managing power on your Mac. Resetting it can resolve certain uncommon issues related to power or thermal management.

support.apple.com

Thanks, the first time rebooting after resetting SMC things did work fine. I'll be interested to see what happens after a sleep / wake cycle. Perhaps this has sorted it out

 

[Glenny2lappies]

On my 2018 Mac mini with this latest update, I'm now having an issue where one of my monitors doesn't wake up after sleep.... I just get a black screen. I have to turn it on and off to get an image. It's a dell ultrasharp connected by Mini DisplayPort. My second monitor (also dell ultrasharp) connected by HDMI doesn't seem to have the issue. This all started immediately after applying 10.15.5.

Is anyone else seeing issues like this? Any suggestions on troubleshooting, etc?

This sounds like a relatively common problem when connecting external monitors to MacBooks and Catalina. It's random, but the monitor will be blank. Two ways to get OSX to re-connect:
* disconnect and reconnect the monitor (which triggers it to re-organise the window layout)
* System prefs > displays > turn mirroring on and off

It's very irritating especially on a $£5k MBP. This has been happening way too frequently since 10.15.1 (when I bought the MBP 16" when it was first released)

 

[RumorConsumer]

Thanks, the first time rebooting after resetting SMC things did work fine. I'll be interested to see what happens after a sleep / wake cycle. Perhaps this has sorted it out

this would have been my suggestion as well. let us know.

 

[JJ71]

Definitely not fixed at this point. I'll fiddle with it a bit more and report back...

 

[JJ71]

Reporting back... it largely does seem better now. On wake just now the only issue I had was that it got the wrong resolution on my main monitor (of two), but that happened some of the time before. The things I did (have no idea which resolved it) were:

1. install combo update
2. reset SMC
3. turn Mac and all peripherals off and unplug from wall
4. fiddle with display prefs (switching primary to secondary and back)

So hopefully I'm good now

 

[tommiy]

The very long thread on the apple community is that you need to leave the blank monitor connected and running for at least 30 minutes. After that it may turn on.

 

[Honza1]

I have something similar with my MBP and LG 4k monitor, but my experience strongly suggests, that it is something related to specific one monitor. I have actually two of those SAME monitors, one home and one work. Same manufacturer usb-DP cable - and same MBP logically. Monitor at work works flawlessly while monitor at home once in a while misbehaves. Same settings.
My conclusion - that specific one monitor has some internal flaw which causes this misbehavior. Not macOS, not MBP, and not cable. And not that LG line of monitors. But it fails so rarely, that I do not care enough to try to get it fixed.
In my case power off/power on for monitor gets everything in order. And good to go for another one or more days...

 

[dompac]

There is a very long thread on apple communities on this topic that started with .4. Looking yesterday there are reports of nothing being fixed. Apparently the only fix is after being connected for 30+ minutes it may start working.

I have the same problem, and even the supplemental 10.15.5 does not fix the prpblem Frustrating

 

[Glenny2lappies]

... My conclusion - that specific one monitor has some internal flaw which causes this misbehavior. Not macOS, not MBP, and not cable. And not that LG line of monitors. But it fails so rarely, that I do not care enough to try to get it fixed.
In my case power off/power on for monitor gets everything in order. And good to go for another one or more days...

Given that we all suffer from this 'blank' monitor problem (and some of us suffer from intermittent crash/panic/restarts), I wouldn't let Apple's rubbish drivers off the hook. (They *are* rubbish as they keep causing grief)

The differences are probably down to something like subtly different timings, maybe slightly different firmware, or maybe just that it's not YET happened to your work machine.

 

[JJ71]

After the supplemental update the problem is back. And separately the supplemental update screwed up my activity monitor prefs... all columns but the process name were gone. I had to trash prefs to fix that.

Given the problem came back I did the same as before... fiddled with displays prefs and reset SMC. After a reboot things came back ok, but will have to see what happens on sleep/wake. I have two Dell Ultrasharps. The primary monitor is the one that seems to be mainly affected. It's shared with a PC, using another input. Win10 never has this issue, nor did OS X before this update.

 

[filbert42]

I had an issue with my Macmini. After sleeping, nothing would make the display come back. I could get to it via VNC/screen sharing, so it seemed like an issue with the HDMI output. Another symptom was that it would take 5 mins or more to restart. After restarting, the display was ok until it went to sleep again.

i cleared the nvram (I’m not clear about the difference between nvram and SMC) and now, fingers crossed, it seems ok. Restarting is back to normal as well.

 

[Glenny2lappies]

I find disconnecting the display and reconnecting it works.

Of course this means that you can't use the display's USB ports for any storage otherwise you get the must eject before disconnecting message.

 

[filbert42]

I had an issue with my Macmini. After sleeping, nothing would make the display come back. I could get to it via VNC/screen sharing, so it seemed like an issue with the HDMI output. Another symptom was that it would take 5 mins or more to restart. After restarting, the display was ok until it went to sleep again.

i cleared the nvram (I’m not clear about the difference between nvram and SMC) and now, fingers crossed, it seems ok. Restarting is back to normal as well.

Spoke too soon - the problem with the display is back. Clearing nvram isn’t helping this time. Haven’t got time to look into it now. Will have to wait until tomorrow.

A bit p’d off with Apple over the quality of recent updates on Mac and iOS.

 

[JJ71]

Mainly I'm finding I just have to turn the display on and off each time the Mac wakes. Certainly it's doable but it's quite annoying...

 

[filbert42]

Spoke too soon - the problem with the display is back. Clearing nvram isn’t helping this time. Haven’t got time to look into it now. Will have to wait until tomorrow.

A bit p’d off with Apple over the quality of recent updates on Mac and iOS.

I've tried unplugging the monitor and switching it off and on but doesn't help. The only thing I've found to resolve the problem is to peer the Mac off, unplug it for 20 secs or so and then restart it - I gather this clears the SMC. I've now set 'turn display off' to never and I hope that will prevent the Mac gong to sleep and all will be OK.
SO much for power saving

 

[JJ71]

It's sort of gotten better over time. Sometimes I have to turn the monitor on and off, and occasionally it's at the wrong resolution. But at least it's better for whatever reason...