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Graphical issues with 2011 iMac and Lion

I have a 2011 27" iMac (core i7 and AMD Radeon HD 6970M 2GB) with 2 external displays, most of the graphical issues are present in the external displays but the menu bar, dock and volume popup all appeared distorted on the main display.

On the external display most apps look like this http://i.imgur.com/FQ0AJ.png

there are a few exceptions like steam, safari and itunes, these apps don't show any distortion apart from when being switched the the other displays though, almost all other apps apear disdorted (as shown in the image) on the external displays.

I never had these issues with Snow Leopard but as far as I can tell its some kind of graphics driver problem, don't know how this wasn't spotted in the beta..

More images:

http://imgur.com/bK3jBl&RSaix

http://imgur.com/bK3jB&RSaixl

iMac, Mac OS X (10.7)

Posted on Jul 22, 2011 9:06 PM

194 replies

Sep 19, 2011 9:49 AM in response to iliassakalak

It's only a driver issue. on this iMac's GPU. Otherwise all of my other Nvidia Mac's are all running flawlessly.

Sep 19, 2011 2:49 PM in response to JoshS182

Same issue here:

iMac 27" i7 6970M

Image of dashboard:

Sep 19, 2011 11:41 PM in response to JoshS182

Another iMac same issues - 3.4GHz, 8GB, 2GB graphics - glitches in menubar, halo's around windows & dialog boxes. Intermittant problem but as with others experiance normally associated with playing web video. Restart normally cures.

Am convinced that it is a driver issue as I regularly use bootcamp to play games and the glitches have never replicated under Win 7.

Going to do battle with Applecare as suggested... will update my results...

Sep 20, 2011 4:21 AM in response to deadcert01

good deadcert01, if all call applecare we can win this war...remember apple say "don't know this issue" at all people... PLEASE CALL APPLE CARE... update your situation deadcert....thanks a lot....

wjang

Level 1

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Sep 21, 2011 10:24 PM in response to alessandro85

Same issue here:

OS X Lion 10.7.1

iMac 27 2011 4GB

Radeon 2GB

Sep 22, 2011 3:20 AM in response to wjang

anyone have news???? i'm tired of this situation.... 😟

Sep 22, 2011 3:22 AM in response to alessandro85

Just curious, what version of flash are you running....

http://www.adobe.com/software/flash/about/

Sep 22, 2011 3:26 AM in response to bobbristow

the problem is NOT flashpalyer... i reinstall lion by 0.... lounch 4 video .MOV in quicktime and start the issue.... STOP think is a problem of adobe flashplayer please......

Sep 22, 2011 3:29 AM in response to alessandro85

Whoa buddy. I was just trying to help. I had this problem every single day at least twice. When I upgraded my flash player the issue dissapeared.

Sep 22, 2011 3:49 AM in response to bobbristow

try again... your problem still there... is sure... video format .MOV don't need flash to run.... if u try to lounch 4 video by quicklook issue start... try and tell me...

Sep 22, 2011 3:51 AM in response to alessandro85

Sorry, my problem went away after I changed my flash version. I have been graphic glitch free for about 2 weeks now.

Sep 22, 2011 3:53 AM in response to bobbristow

another fix for now is log out than log in without restart....

Sep 22, 2011 4:17 AM in response to bobbristow

i try now to lunch a video by quicklook (spacebar) and i have this issue... the video is a simple iphone 4 video :MOV format don't need flashplayer.... u get wrong.....

Sep 22, 2011 4:42 AM in response to alessandro85

You must be real fun at parties!

Sep 22, 2011 7:35 AM in response to alessandro85

If you look on page 4, I mention in my 2nd post that it happened to me after using quicklook. I was watching video taken with my iPhone. I believe I may have been doing that the first time too. I also mentioned that you don't need to restart but simply log-off gets rid of the screen glitch.

I also believe that this glitch may have more than one cause which triggers it. It may well be the case that versions of Adobe Flash could cause the glitch along with quicklook in the finder. Upgrading Flash may have seemed to fix it for some because they may not use quicklook. I don't use flash that often and rarely watch youtube or anything else online.

For those that have, or had the problem with YouTube, what types of video would cause the problem - was it regular 320p or did it happen more with 720p and higher?

I am pretty sure that it is a driver problem which allows applications to use GPU hardware acceleration and video overlay. Youtube is known to use the GPU and quicklook also would use it when playing back H.264 files.

I notice that when it happened the 2nd time, I got a flash of pink/purple line in the video right before it glitched.

Graphical issues with 2011 iMac and Lion