Screen freezes for a few seconds

Hello,

a few days ago, I began to notice my mac is getting issues with completely freezing up for a few seconds. The screen is completely stationary, the cursor isn't moving and the clock's seconds do not count forwards. Audio is still continuing to run fine. No particular action on my part is prompting this behavior, it just completely randomly freezes up.

I ran the console in the background to see if there are consistent messages that appear whenever these freeze-ups occur. I finally found them, apparently there is some issue with the intel integrated graphics:

fault 10:14:07.579724 +0200 kernel virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): initial wait for 1 second expired. Continue wait for 4 seconds. stamp 804926 (gpu_stamp=804925)

fault 10:14:11.580622 +0200 kernel virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 804926 (gpu_stamp=804925)

fault 10:14:11.580639 +0200 kernel void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4

fault 10:14:11.580643 +0200 kernel void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4

fault 10:14:11.580692 +0200 kernel void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4

fault 10:14:11.580695 +0200 kernel void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

fault 10:14:12.642643 +0200 kernel virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): initial wait for 1 second expired. Continue wait for 4 seconds. stamp 804927 (gpu_stamp=804926)

fault 10:14:16.642803 +0200 kernel virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 804927 (gpu_stamp=804926)

fault 10:14:16.642817 +0200 kernel void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4

fault 10:14:16.642821 +0200 kernel void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4

fault 10:14:16.642869 +0200 kernel void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4

fault 10:14:16.642872 +0200 kernel void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

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:	MBP114.0183.B00

System Version:	macOS 10.13.5 (17F77)
Kernel Version:	Darwin 17.6.0

I was wondering if someone else has similar issues and if there are potential fixes out there. These hangs are very annoying and completely random. Also, I don't remember installing some particular piece of software before this issue started occurring, so I'm stumped as to what has changed. Could this be a hardware issue?

MacBook Pro with Retina display, macOS High Sierra (10.13.5)

Posted on Jul 13, 2018 1:27 AM

Top-ranking reply

gplewis

Level 1

4 points

Posted on Jun 17, 2019 11:16 AM

Hey have you tried turning 'automatic graphics switching' off in the energy panel of settings? The thinking being it will force use of the GPU rather than the integrated intel graphics chip and hopefully stop the kernel fault.

View in context

257 replies

Jun 28, 2019 7:41 PM in response to BDAqua

For me, not using Safari greatly reduces the frequency, but it still happens occasionally. I'm not sure my problem is exactly the same, though.

Aug 18, 2019 5:37 AM in response to Obstkäufer

Perhaps not if it only affects a select few older Macbooks that don't play nicely with a specific video driver...

tchk_

Level 1

8 points

May 16, 2020 4:29 PM in response to NachbarsKatze

I have the same issue and console message. And CPU loads by "DumpGPURestart" process.

mcmoyer

Level 1

4 points

Jul 18, 2018 11:55 AM in response to NachbarsKatze

I'm also seeing the same behavior. I'm also seeing similar items in my console.app whenever the system hangs

fault	12:51:02.037487 -0600	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 207378 (gpu_stamp=207377)
fault	12:51:02.037520 -0600	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4
fault	12:51:02.037542 -0600	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4
fault	12:51:02.037611 -0600	kernel	void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4
fault	12:51:02.037618 -0600	kernel	void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)
fault	12:51:03.042662 -0600	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): initial wait for 1 second expired. Continue wait for 4 seconds. stamp 207379 (gpu_stamp=207378)
error	12:51:05.217596 -0600	Safari	nw_connection_get_connected_socket 3262 Connection has no connected handler
error	12:51:05.217781 -0600	Safari	TCP Conn 0x608000b61380 Failed : error 0:61 [61]
fault	12:51:07.043629 -0600	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 207379 (gpu_stamp=207378)
fault	12:51:07.043647 -0600	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4
fault	12:51:07.043651 -0600	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4
fault	12:51:07.043703 -0600	kernel	void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4
fault	12:51:07.043706 -0600	kernel	void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

Jul 25, 2018 1:38 AM in response to mcmoyer

My freezing issue is still there. I uninstalled the Nvidia graphics driver I had installed for an external graphics cards and updated to 10.13.6. The issue was only solved temporarily again, the freezings still occur. This is really starting to get frustrating!

Aug 6, 2018 1:50 PM in response to Xcoder

I recently got the 2018 15" i7 MacBook Pro. It has worked without any hitches for the last couple of weeks. Today while browsing in Chome the screen froze in a kind of multicoloured zig-zag pattern. There was no key or mouse response so I had to reboot from the boot button. Everything looks normal again. That's all I can report (I'm not tech savvy) but I'm now apprehensive for the next "incident".

Aug 6, 2018 3:19 PM in response to NachbarsKatze

NachbarsKatzeThanks - I was concerned it might be a hardware issue. And, yes, all the 15" models have dedicated GPUs. Trouble is if this problem is intermittent it is impossible to demonstrate and get a replacement (it is beyond the 14-day return policy). If I had been thinking straight at the time I should have just taken a photo of the screen as evidence. I'll do that if it happens again. All my Final Cut Pro video stuff (that's all I basically do on this machine) I keep on external drives, so no concern about data loss if this thing goes belly-up.

Sep 4, 2018 10:07 AM in response to NachbarsKatze

Same problem here, it happens multiple times a day.

Console report from a few days ago:

My device:

Modelo: MacBook Pro

Identificador de modelo: MacBookPro11,4

Nome do processador: Intel Core i7

Velocidade do processador: 2,2 GHz

Número de processadores: 1

Número total de núcleos: 4

Cache L2 (por núcleo): 256 KB

Cache L3: 6 MB

Memória: 16 GB

Versão da ROM de arranque: MBP114.0184.B00

FabGau

Level 1

9 points

Sep 26, 2018 5:26 AM in response to NachbarsKatze

Hi there, I'm in...same annoyning behavior and apparently same errors in the Console.

MacBook Pro 13, late 2013

2,6 GHz, i5, 16GB 1600 MHz DDR3

Intel Iris 1536 MB

macOS Mojave 10.14

I really hoped Mojave could fix this but nothing happened.

Sep 27, 2018 3:42 PM in response to FabGau

Chiming in hoping that some finds a fix. It is really annoying.

I have the same issue with the same error messages in the Console when it occurs. I am using a MacBook Pro (Retina, 15-inch, Mid 2015), with the display set to default resolution, and I also just upgrade to Mojave hoping it would fix the problem, but it is still occurring.

Has anyone every heard anything form Apple on this issue?

Oct 9, 2018 6:29 PM in response to pjkelnhofer

I did a Clean Install 3 days ago and did not have the "IOAccelEventMachine2::waitForStamp" error until today. Then I had 6 "IOAccelEventMachine2::waitForStamp" freeze errors in a row over the course of 4 minutes. Ugh!

fault	20:05:55.014902 -0400	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): initial wait for 1 second expired. Continue wait for 4 seconds. stamp 621382 (gpu_stamp=621381)
fault	20:05:59.016883 -0400	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 621382 (gpu_stamp=621381)
fault	20:05:59.016900 -0400	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4
fault	20:05:59.016905 -0400	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4
fault	20:05:59.016955 -0400	kernel	void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4
fault	20:05:59.016958 -0400	kernel	void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)

Oct 21, 2018 3:31 PM in response to NachbarsKatze

same issue on High Sierra and Mojave (upgrade and clean install).

Model Name:	MacBook Pro
Model Identifier:	MacBookPro11,1
Processor Name:	Intel Core i5
Processor Speed:	2.6 GHz
Number of Processors:	1
Total Number of Cores:	2
L2 Cache (per Core):	256 KB
L3 Cache:	3 MB
Memory:	8 GB
Boot ROM Version:	MBP111.0146.B00

Oct 21, 2018 8:19 PM in response to printhead

Just to reiterate, I am posting my MacBook Pro's info as well...

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:	MBP114.0184.B00
SMC Version (system):	2.29f24

Nov 8, 2018 9:32 AM in response to BDAqua

Definitely not a heat issue. Sometimes when it happens my computer has basically just started up, and has nothing open but maybe one browser tab that doesn't have much going on it.

I think all the other people in this thread would agree that the two most frustrating things about the issue are its randomness, and Apple never addressing it.

sx0

Level 1

4 points

Nov 12, 2018 2:00 PM in response to NachbarsKatze

the same issue on Mojave:

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

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Screen freezes for a few seconds

fault	10:14:07.579724 +0200	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): initial wait for 1 second expired. Continue wait for 4 seconds. stamp 804926 (gpu_stamp=804925)
fault	10:14:11.580622 +0200	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 804926 (gpu_stamp=804925)
fault	10:14:11.580639 +0200	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4
fault	10:14:11.580643 +0200	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4
fault	10:14:11.580692 +0200	kernel	void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4
fault	10:14:11.580695 +0200	kernel	void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)
fault	10:14:12.642643 +0200	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): initial wait for 1 second expired. Continue wait for 4 seconds. stamp 804927 (gpu_stamp=804926)
fault	10:14:16.642803 +0200	kernel	virtual IOReturn IOAccelEventMachine2::waitForStamp(int32_t, stamp_t, stamp_t *): timeout waiting for IntelAccelerator stamp 804927 (gpu_stamp=804926)
fault	10:14:16.642817 +0200	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t) - Setting restart type to 4
fault	10:14:16.642821 +0200	kernel	void IOAccelEventMachine2::handleFinishChannelRestart(IOReturn, int32_t, uint32_t): GPURestartDequeued stampIdx=4 type=4 fromWhere=1 waitingOnIdx=4
fault	10:14:16.642869 +0200	kernel	void IOAccelEventMachine2::restart_channel(): GPURestartSkipped stampIdx=4 type=4
fault	10:14:16.642872 +0200	kernel	void IOAccelEventMachine2::restart_channel(): no channel associated with stamp_idx 4 (type 4)