Screen freezes for a few seconds

Hi robogobo,

Apple introduced this bug with High Sierra (10.13) and has yet to fix it on any update through the current version of Catalina. I gave up and went back to Sierra (10.12.6) and haven't had the "IOReturn IOAccelEventMachine2" error since on similar hardware:

Model Name: MacBook Pro

  Model Identifier: MacBookPro11,4

  Processor Name: Intel Core i7

  Processor Speed: 2.2 GHz

  Number of Processors: 1

  Total Number of Cores: 4

  L2 Cache (per Core): 256 KB

  L3 Cache: 6 MB

  Memory: 16 GB

  Boot ROM Version: 194.0.0.0.0

  SMC Version (system): 2.29f24

Apple does know about the issue as many posters to these community pages have uploaded full bug/crash reports. However, it does appear that they will not or cannot fix the issue for whatever reason. If you submit a bug/crash report they eventually come back to you saying it's a "duplicate report" and never answer your follow ups. Very frustrating!!!

Like anerdinseattle wrote: If I just run my daily applications (Safari closed, no video running in background) then no freezes for days and weeks appears.

The problem seem to have been fixed on the latest update at least on my MacBook Pro of mid 2014 after Mac OS X 10.14.5.

It was so annoying!

Yeah - it appears to occur if Safari has > ~15 tabs open. Restarting Safari resolves the issue. Strange.

The only 100% fix is to install 10.12.6. We will never get a fix from apple for any Mac OS later than 10.12.6 on our 2015 15” MBP’s.

I have observed that this error is more likely to occur when my processor is under strain. It happens with or without my browser running, but it is more likely to happen when my browser is running, and to happen more often when my browser is running. It is more likely still to happen if I have a video window -- Netflix, Amazon Video, or Hulu -- open somewhere in my browser tabs, or if I have a movie paused on iTunes, running in the background.

I mostly use my Mac to write in Word. If I just run Word, with other applications closed (rather than running in the background) I can go for days or weeks without having this error pop up in my console.

Other threads talk about UI freezes in response to HDMI peripherals, with a similar error code.

I really think it's some kind of glitch in the load balancing for the graphics, and I think it's endemic to 15" Mid-2015 models.

I never use Chrome because of all the memory issues that it has. All I know is that I switched from Safari to Firefox over two weeks ago and I have not seen the freeze issues. Before that, it would have multiple times a day.

Just to possibly awake someone at Apple, I too believe Safari is the issue. After a reboot and only using Chrome for days/weeks I have not experienced the "IOAccelEventMachine2" freeze. I also 1000% agree that not using Safari is NOT a fix but a workaround. I am so frustrated that what seems to be an easy fix from Apple has not happened in the multiple OS updates starting with High Sierra (when the issue seems to have started) through multiple iterations of Mojave. I have been using Apple MBP's/PowerBooks for literally 28 years (since the PowerBook 170) and this issue (plus the $2k plus starting costs) is strongly discouraging me from buying another Apple laptop of any kind. Please Apple, any official response to the multiple postings of the same DOCUMENTED issue would be the professional thing to do!

Just do not use Safari app, or do not use it for longer period over the day and quite the app after usage. There are a range of other browsers which are useful you should switch to. Do not expect support from here...

I just received feedback from Apple through Feedback Assistant asking to gather "new sysdiagnose captured in macOS 10.14.5 18F132 within three days from the most recent crash. Old logs are missing gpu restart log." I let them know that I'm now running 10.14.6b1 trying to give feedback that way, and pointed to multiple sysdiagnose through the Feedback Assistant w/ the other feedback issue numbers. I'm hoping someone's seriously looking into this now.

Hopefully others here can also provide reports of the issue and sysdiagnose through https://feedbackassistant.apple.com/

After days without the problem, I launched Safari again with a minimal number of tabs open. This also ran for several days without a problem.

After opening a few tabs with WWDC session videos, the problem occurred again within minutes. I don't actually start any of the videos playing, and I have videos set to never auto-play, but they do still load some of the stream and show a player (presumably quicktime). The pause under these conditions seems to occur more often when I switch workspaces to a full screen app.

It has been six days for me since I stopped using Safari, and I have yet to see a freeze since then. So maybe the issue is related to Safari after all. Any one try this fix?

What temps does this App report around freezing time?

MacFansControl…

https://www.crystalidea.com/macs-fan-control

You can see dates of previous installs in System Report>Software>Installations.

Just as an update, I have not used Safari for the last 2 weeks, not a single freeze since.