2011 13 MBP i5 ***debug info for apparent hang in main graphics engine ***

I'm having this same trouble with a Mac mini server 2011 (Lion). As others have done, I imported my account setting from a previous machine. The machine is very slow and takes a long time to respond, especially when displaying web pages.

Someone with similar errors at http://www.insanelymac.com/forum/index.php?showtopic=259705 was able to solve hist problem with a hex editor. He says it is a driver problem.

Same error here (Macbook Air 13" Mid2011):

WaitForStamp: Overflowed waiting for stamp 0x4 on Media ring: called from

timestamp = 0x0003

**** Debug info for apparent hang in Media graphics engine ****

ring head = 0x00000010, wrap count = 0x 0

ring tail = 0x00000080 ring control = 0x00003001 enabled, auto report disabled, not waiting, semaphore not waiting, length = 0x004 4KB pages

timestamps = 0x0003

Semaphore register values:

VRSYNC: (0x12044) = 0x8e754

BRSYNC: (0x22040) = 0x0

RVSYNC: (0x 2040) = 0x0

BVSYNC: (0x22044) = 0x0

RBSYNC: (0x 2044) = 0x0

VBSYNC: (0x12040) = 0x0

kIPEHR: 0x1000000

kINSTDONE: 0xfffffffe

kINSTDONE_1: 0xffffffff

it causes very long wakeup time and high load. It started to happen without installing any new programs or anything...VERY ANNOYING!

Same issue with macbook pro 13 (early 2011). Hope Apple fixes that asap.

Same problems here with a 2011 Mac Mini (not server) running Lion 10.7.2 as a media PC connected to my TV with HDMI. I have not migrated anything, this is a fresh 10.7.0 factory installation that has been upgraded to 10.7.1 and then 10.7.2.

I seem to be able to trigger the problem when running screen sharing, connecting to the Mini from another Mac.

My computer is running 24/7. When I checked the logs this issue only appeared when I was using the computer, either through screen sharing or through Plex which is my main use for this machine.

According to a thread on insanelymac you can either do some hex editing (let's call this the "advanced" option) or unplug the connector to the external display for a couple of seconds and then reconnect it.

I rebooted my Mac Mini without having my HDMI connector plugged in (which probably wasn't necessary) and the problem seems to have gone away. No hangs when connecting through screen sharing and I've also checked the /var/log/kernel.log file and no more

**** Debug info for apparent hang in Main graphics engine ****

in the file.

It would of course be better with a proper fix from Apple, but it is at least a workaround until then.

Hi,

I am seeing this same error on my Mac Mini Server 2011.

I am in contact with the Apple support since mid January for resolving this.

So far what has been done:

1- PRAM reset

2- submission of logs to Apple using their EDC program (used to collect and send logfiles to Apple)

3- Replacement of the main board

The issue keeps coming every 7-8 days.

Rebooting without the hdmi cable plugged-in doesn't prevent this error from occuring (this workaround was suggested on a post before).

Could this be related to some software I am using?

I am running the following:

- Wine VNC

- VMWare Fusion

- DynDNS Updater

Any help or common pattern to help better understand the issue are very welcome.

Thanks

Same problem here, 13" MBP Pro 2011, no external display, not migrated from any older version. Lion 10.7.4.

Hi Rafales,

I am still facing this issue even after mainboard and RAM change.

Is there any programm that I use and you are also using?

Thanks

I had issues with waking up my mac since I bought it. Additionaly - recently my mbp hung twice ( this issue: https://discussions.apple.com/thread/3219125?start=0&tstart=0 ).

One app that I think may be causing this is virtualbox (it installs some kernel modules). I'm also using InsomniaX but I had those issues before I installed it. Also - did you upgraded your RAM to 8 gigs?

Yes, I have upgraded my RAM to 8Gig

Well, that's a common factor. I bought my mac from an authorised reseller with RAM and HDD already upgraded and I have issues from day one. It sounds a bit stupid that mac can't handle 8 gigs of ram but there is nothing else I can think of.

Cool update: the problem is not occuring any longer on my mac mini server: the server has been running for 19 days and hasn't crashed (used to crash every 7-8 days before).

This is a major win: no need any more for a crontab server reboot every monday morning!

What changed?

I stopped using VMWare Fusion.

Instead I use VirtualBox to run virtual machines

I am suspecting Mac OS Lion to let VMWare run instructions that the MacOS graphic layer doesn't support.

This is clearly a bug for Mac to resolve, hope to see a fix soon.

On the meantime, if you are facing the same issue, I would recommend giving a go at VirtualBox and seeing if your issue goes away with the change.

I've never been using VMWare (I use VirtualBox) so it's not the cause of this problem.

1- What is the frequency when you see this problem occuring

2- are you in touch with Apple support?

1. Once a month, maybe twice.

2. No. There's no good support in my country. And the problem is too hard to reproduce so there's no way I can get my mbp replaced.