Q: OSX Lion + 2011 iMac 27'' + Video = Freeze

Add me to the list of iMac 27" (core i5 in my case) having this problem. Disappointing. Will be a reminder to me not to update to a new version of MacOS until the first 'dot one' update.

Add me to the list (2011 iMac 27" (6970 2GB))

Same problem for me. iMac 27" 2011 ATI 6970 with 2GB vram.

I am also experiencing this problem. I've seen this primarily with embedded video in a web site after waking from sleep. Mouse moves everything else is frozen. I logged in while frozen using SSH could poke around a bit, and thought that doing a software reboot may be less harmful than the Power button reboot so I did a sudo reboot and then SSH quit like I expected but then system did not reboot.

I had zero problems under 10.6.8 My system configuration is:

  Model Name:    iMac

  Model Identifier:    iMac12,2

  Processor Name:    Intel Core i7

  Processor Speed:    3.4 GHz

  Number of Processors:    1

  Total Number of Cores:    4

  L2 Cache (per Core):    256 KB

  L3 Cache:    8 MB

  Memory:    12 GB

  Boot ROM Version:    IM121.0047.B0A

  SMC Version (system):    1.72f2

  Serial Number (system):    C02FV2XKDHJW

  Hardware UUID:    84D2CC08-F6DE-583D-A8A4-4B3D78871773

  Chipset Model:    AMD Radeon HD 6970M

  Type:    GPU

  Bus:    PCIe

  PCIe Lane Width:    x16

  VRAM (Total):    2048 MB

  Vendor:    ATI (0x1002)

  Device ID:    0x6720

  Revision ID:    0x0000

  ROM Revision:    113-C2960K-152

  EFI Driver Version:    01.00.507

Also the system log shows a GPU dump fails like everyone elses:

7/25/11 9:40:42.000 PM kernel: ** Device in slot: SLOT--1 **

7/25/11 9:40:42.000 PM kernel: ** GPU Debug Info Start **

7/25/11 9:40:42.000 PM kernel: 0x00006720

7/25/11 9:40:42.000 PM kernel: 0x0000008f

7/25/11 9:40:42.000 PM kernel: 0x00000001

7/25/11 9:40:42.000 PM kernel: 0x00000018

7/25/11 9:40:42.000 PM kernel: 0x0000a880

7/25/11 9:40:42.000 PM kernel: 0x00000001

It would be helpful if Apple could release a statement on what we should do until this is fixed: e.g. go back to snow leopard, always shut down vs. sleep, etc

Just wanted to stress  that I'm experiencing the problem on a 21.5" iMac as well.

The iMac I have  has the same AMD HD 6770M as the 27" basic model.

Sometimes, i have 2 bug on my iMac 2011 i7 3.4... :

1. The frozen bug, need a restart with the power button

2. When i watch a video on youtube, a graphic bug on my vid, i make a video : http://www.youtube.com/watch?v=olIyj2zz1Xc

The apple on the menu is hidden, we see some little graphic bug on the menu bar.

Excuse my english, i'm french

This is ridiculous.   Same problem here:  2011 27" iMac  6970 1GB RAM.  Hey Apple, How about less secretive product launches and more open beta testing.

Dear All,

For the video bug you have two options:

1. Uninstall Adobe Flash player and use HTML5 where possible. Better is to use Chrome, that has his internal Flash player
2. Use a Beta version of Adobe Flash Player for Lion

Google these two solutions and try. Worked for me both.

Its not just flash videos, read the thread before posting.

HTML5 youtube will crash it too

I did'nt say that it was with Flash videos only, I said that that uninstalling the Flash Player solved my crash issues in ANY case. I don't know why, but also Finder graphics were involved!

The two solutions made everything working fine again. It could be a shared library, maybe, but it worked. So I think you guys could give it a try.

Good luck.

Same here. 27" iMac, a few weeks old.

Uninstalling Flash didn't help here.

Same issue here with 27" (2011) + OS X Lion. It worked perfectly before the lion update. Now it freezes everytime when playing video after sleepmode. Please, Apple, fix that.

Flash player version 10,3,181,34

  Modellname:          iMac

  Modell-Identifizierung:          iMac12,2

  Prozessortyp:          Intel Core i5

  Prozessorgeschwindigkeit:          2,7 GHz

  Anzahl der Prozessoren:          1

  Gesamtanzahl der Kerne:          4

  L2-Cache (pro Kern):          256 KB

  L3-Cache:          6 MB

  Speicher:          4 GB

  Boot-ROM-Version:          IM121.0047.B0A

AMD Radeon HD 6770M:

  Chipsatz-Modell:          AMD Radeon HD 6770M

  Typ:          GPU

  Bus:          PCIe

  PCIe-Lane-Breite:          x16

  VRAM (gesamt):          512 MB

  Hersteller:          ATI (0x1002)

  Geräte-ID:          0x6740

  Versions-ID:          0x0000

  ROM-Version:          113-C0170F-170

  EFI-Treiberversion:          01.00.544

Überblick über die Systemsoftware:

  Systemversion:          Mac OS X 10.7 (11A511)

  Kernel-Version:          Darwin 11.0.0

  Startvolume:          Macintosh HD

  Startmodus:          Normal

Sorry to hear that.

Interestingly, I can't get mine to freeze _every_ time after sleep. Some times I have to try several times to get a freeze, as I did yesterday for an Apple technician.