Q: OSX Lion, Graphic Artifacts

yes i have 21,5 and 27 inch.  i have issue only with 27... but the problem is with 6970M videocard... not depend from model of imac...

Posting this again

Specs:

27-in, Mid 2011 iMac

Processor  3.4 GHz Intel Core i7

Memory  16GB

Graphics  AMD Radeon HD 6970M 2048 MB

Software  Mac OS X Lion 10.7.1 (11B26)

Main problems:

1. Hangs on grey screen on reboot for 30s-5m. (...with these specs it should be around 20 seconds?)

2. Graphics artifacting on the usually mentioned places

3. Vertical lines through the iMac screen. (not other monitors, disappear on reboot)

4. None of the mid 2011 iMac Firmware updates are for my machine? ....

5. Some of the pink and green youtube flickering previously described. (log out/in works!)

6. Thunderbolt monitors lose desktop picture. (resetting image and logging out/in don't work, must reboot)

7. In boot camp with win 7, played 3 differnt games and they all crash randomly with coloured flashing screens. Horrible problem here.

omg!!!! theres no escape!!!! maybe lion installation broke videocard???? maybe i will sell mac for windows.... 

After weeks of testing, I can pretty much safely say that for me, the artifacts only occur when watching streamed video in fullscreen mode. I've tested it on several sites and with several apps. Always happening when wathing videos hosted on YouTube, happened couple times while watching videos on Revision3. Happens in browser with both Flash and HTML5 (ClickToFlash), Plex (YouTube and Rev3 plugins) and some other desktop apps that stream YouTube video.

Never happened on Vimeo yet. Also, haven't happened with Tubbler yet, even though it streams YouTube video. Never happens when watching video stored on local hard drive, no matter which app.

So my guess is that Flash, HTML5 and the plug-ins that some other desktop apps use, have some incompatible/outdated code that messes up 6970M only in the streamed video situations.

I have the issue with simple iphon 4 video (.mov) with quicktime or quick look... And i test with clean lion without flashplayer or anything 3part app installed....The issue stil there I think the problem is'nt in flashplayer.. I think is a videocard driver incompatibility in lion.... I was tried with snowleopard... The issue never appear.... This is my case with this spec:  iMac 27'' mid 2011 i5 ATI Radeon 6970M 1GB ... If u wanna do more test try with transfer 4/5 .mov videos on desktop and lounch with quicktime or quicklook.... After some plays green or purple flash appear in the video window and graphic artifacts on the dock, menù bar and on dashboard widget... Try and try again ... The issue not apper always but random.... Update please.... And CALL APPLE please.....

So far as I'm aware, yes  -  and the 27 has only Lion installed.   If anyone can spell out how to install Snow Lion or even eaarlier for a try it could perhaps be beneficial . . .

Ron for snowleopard u need install disk

Did some one tried to get ATI drivers from snow leopard? (even they are with highest possibility 32bit)

Has anyone found anything redeeming about lion yet? 

So far I know this, I had to reset all the setting to make it behave like snow leopard, tons of errors as described in this forum, bland interface (all grey icons in finder), old programs that were powerpc based no longer work.

Oh they added a button to get to your applications better, that's nice I guess...

Also, I talked to customer service yesterday and they were very nice, but supposedly had no idea about the problem and treated it like a isolated instance. 

they say to all people that an isolated problem.... is a ******* policy.... wath can we do guys????

we can't install nothing before lion....all software are incompatible with lion.......  please apple we can't do nothing without your fix....

Question for everyone: Was lion installed on your computer when you recieved it or did you upgrade from snow leopard?

My computer came installed with lion.

(I just spoke to apple about my issue and I had mentioned that I may downgrade to snow leopard, but apparently it isn't possible if my computer came already installed with lion.  There are some major firmware difference I guess?  I am wondering if there is any connection.)

iMac 3.4 GHz Core i7

AMD HD6970M 2048MB

OS X 10.7.1

I am seeing the  same artifacts on the Finder Window.

I've noticed that if you connect a second monitor to the iMac, the problem goes away. Sounds like a video driver issue to me.

Got a new 27" iMac in June that was preinstalled with SL. Upgraded to Lion with the free upgrade program. Luckily kept SL on a seperate partition (which has been running constantly for 48+ hours with no artifacts).  For me the problem is more nuisance than anything but am worried about long term ramifications.

Just restarted in Lion to check e-mail (did not bother to setup in SL partition yet) and after i came back after five minutes the "space invader" artifacts were back. The only thing runnning with video was Weather HD.