Screen freezes for a few seconds

I just added a bug report, we will see if I hear anything back. Not sure if anyone else in the thread has. The only other time I submitted a bug report to Apple it simply got marked as a duplicate by Apple and the original is still listed as "Open". I never heard anything else about it from them. Hopefully, this time I will get some sort of reply.

I just added a bug report too. I went two days without the "virtual IOReturn IOAccelEventMachine2" error, then I had 3 in a row within 2 minutes of each other. Thank you for the bug report suggestion!

Hello NachbarsKatze,

I get the same errors, will you say please, did you find a solution to this problem?

Thank you!

2:42PM

* virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): initial wait for 1 second expired. Continue wait for 4 seconds. stamp 141114 (gpu_stamp=141113)

* virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 141114 (gpu_stamp=141113)

* void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4

* void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4

* void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4

* void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

2:45PM

* Trying to grab power assertion while we already have one

* void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4

* void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4

* void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4

* void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

2:55PM

* virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 155547 (gpu_stamp=155546)

* void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4

* void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4

* void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4

* void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

3:00PM

* virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 162748 (gpu_stamp=162747)

* void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4

* void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4

* void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4

* void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

I found an opportunity to get rid of this problem. I shot a video of how I solve this problem. You can take a look at YouTube can be useful to you. How to overcome Screen Freezes for a few seconds on MacOS Mojave - YouTube

Hi Nick,

Thank you for the video. What is the last step to complete the fix? Are you deleting what you highlighted?

logout

Saving session...

...copying shared history...

...saving history...truncating history files...

...completed.

Deleting expired sessions...3 completed.

I have this problem too on my MacBook Pro (Retina, 15-inch, Mid 2015).

I am running Mojave, but I believe this problem was also present on High Sierra.

These console fault messages coincide with the pause:

fault	16:21:09.465680 +0000	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 4169292 (gpu_stamp=4169291)
fault	16:21:09.465696 +0000	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4
fault	16:21:09.465700 +0000	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4
fault	16:21:09.465750 +0000	kernel	void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4
fault	16:21:09.465753 +0000	kernel	void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

  Model Name: MacBook Pro

  Model Identifier: MacBookPro11,5

  Processor Name: Intel Core i7

  Processor Speed: 2.5 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: 187.0.0.0.0

  SMC Version (system): 2.30f2

  System Version: macOS 10.14.2 (18C54)

  Kernel Version: Darwin 18.2.0

dude did this stop happening to you?

this freezing is making my mac book inoperable, its getting on my nerves .

and apple isnt doing anything, i am sure more people are facing this error and if by some way this thread can be reached by those facing error, and gets more input, apple will then provide the required fix

And its happening on my mac book 2013 too, like very often it starts to mess my work flow.

Thanks for the reply, i will make a video and link it to this thread so we can gather enough people so atleast then apple will acknowledged that its not random!!

Getting this specially after updating to Mojave. I notice that every time I get timeout waiting for IntelAccelerator stamp fault in the console, around it there are many WebKit errors around the same time.

Same happening here on my MacBook Pro (Retina, 13-inch, Mid 2014), running latest Mojave 10.14.3.

Model Name: MacBook Pro

  Model Identifier: MacBookPro11,1

  Processor Name: Intel Core i7

  Processor Speed: 3 GHz

  Number of Processors: 1

  Total Number of Cores: 2

  L2 Cache (per Core): 256 KB

  L3 Cache: 4 MB

  Memory: 16 GB

  Boot ROM Version: 149.0.0.0.0

  SMC Version (system): 2.16f68

fault 20:27:18.860307 +1100 kernel virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): initial wait for 1 second expired. Continue wait for 4 seconds. stamp 2761220 (gpu_stamp=2761219)

fault 20:27:22.860431 +1100 kernel virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 2761220 (gpu_stamp=2761219)

fault 20:27:22.860441 +1100 kernel void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4

fault 20:27:22.860443 +1100 kernel void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4

fault 20:27:22.860496 +1100 kernel void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4

fault 20:27:22.860498 +1100 kernel void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

Hi everyone, I've been having this same issue since installing High Sierra on my MB Pro 2013, since then I've patiently waited for Apple to solve this issue. Having read through the messages, I can confirm root cause is the same (same messages got in Console).

Let me also add another point here that I didn't see any reference to: this is not the only freeze I get on my MB Pro, I also have the now-regular 3 second freeze whenever I wake my MB Pro up, before I am able to enter my password... I dont even bother to search online to see whether this is solvable or not.. Its such a fundamental problem that I am sure Apple folks are experiencing it as well. So what's keeping this problem from being solved?

I dont think this is hardware related, because I've had almost no problems until I upgraded to High Sierra.

I am tired of searching for solutions for bugs like these..

I've been a happy MB Pro user since I made the switch from a Dell XPS m1530 back in 2010. I've come to see myself revising this position despite the fact that I'm heavily invested in the ecosystem and that I actually love the products. Cant imagine myself using a non-iphone still. But I cannot say the same anymore about my Macbook Pro.

I am guessing many of you are following the comeback of Windows + impressive new Windows-based PCs out there (well what's the harm in saying, I really like the new Dell XPS 15).

I am not a power user as many of you probably are, but I see a pattern emerging: with every new IOS and Mac OS update, average level of "bugginess" is increasing, with even less diligence and attention to detail to solve such problems. Apple used to be on top of these things, solving them without us even needing to report it, without us even probably experiencing the problem in the first place! Its what I call the "steve jobs" spirit. I just dont see that spirit in Apple anymore..

I am due for a laptop update soon. I am already almost decided that I would not buy the new generation MB Pro. I love the MB Pro 15, the 2015 model just before the new generations. Its either that or the Dell XPS 15 from 2018.. I really dont like the idea of having to go back to Windows, but everytime I lift my screen to enter my password, or experience a 3second freeze, I come one step closer to tipping to Windows ecosystem!

Apple folks, please, get on top of this already, and similar "user-experience-killer" problems which started to occur quite a lot in your ecosystem across the board!

(While writing this entry which took me about 15min, got two of these freezes... I get it about 15-20 times a day throughout my work day now, you can imagine how annoying it is now)

Mine did not freeze like this until the last month, so maybe it does have something to do with a system update. I remember one recently that took about 20 minutes to install.

In my case, the computer freezes for up to a minute or more. I think sometimes the cursor is frozen and sometimes it isn't. Sometimes the beach ball will be spinning. It seems like I can always wait it out and it never results in a crash. I have had an occasional black screen crash, but I don't think it is related to this.

I have a MacBook Pro, 15 inch 2016 pretty much maxed out.

Safari most likely is the problem. But not using safari, or not keeping safari open is not a way to solve the problem, just to avoid the symptom. I have to have at least 3-4 tabs open at any given time to manage my daily workflow..

We are nearing a year and Apple has not addressed this yet? I have the same exact issue.

Randomly, without a consistent reason (not during any particular task or app as far as I can tell), my macbook (2015) freezes for a few seconds.

Posting in hopes that someone at Apple cares enough to get to the bottom of this. I have reinstalled my OS twice and each time the problem rears its head within the week. It's extremely frustrating. No way I am buying another MacBook if this is how they deal with such a pervasive problem.

I did the whole posting of a bug report and accompanying data file dump to Apple about this issue. Apple came back and said it was a "duplicate report" and closed my case. I couldn't find the "duplicate report" they were referring to as Apple apparently likes to keep that information hidden/secret. I never received ANY follow up from Apple. Brand loyalty (20 plus years) doesn't seem to mean much to Apple anymore. Yes, I have had a diagnostic at an Apple Store and they said everything was ok with my MBP. Again, I firmly believe that this is Safari/High Sierra/Mojave related. It's just such a random issue (10 times in one day or one time in 10 days) that I'm not sure even Apple knows how to fix it.