iMac mid 2010 graphics issues after installing Yosemite

of interesting note, since discovering this thread last week, i turned off transparency and am just realizing that i haven't seen the pretty multicolored blocks the past few days; not to say it's fixed ... just a current observation

Is possibile that the problem was Safari?

I've had a lot of problem of graphic glitches , but when I do not use safari....the problem seem to be solved...

Anyone can tell something about this issue?

It does not matter if I send the computer to sleep with the bluetooth keyboard or the power button. Only if I wake it up with a bluetooth device it shows the lag problem. Waking up with the power button shows no lag problem.

The 'bluetooth' device is a red herring I think. I have a wired keyboard, not a bluetooth one, and (as for you), waking with the keyboard will produce the fault, whilst waking with the power button does not produce the fault. I don't think bluetooth itself is relevant. For me anyway, it boils down to 'wake with power button' = no fault, 'wake with keyboard or mouse' = problem.

It occurs to me to try waking it using network access, (i.e. not with a connected peripheral, nor with the power button), and seeing where that leaves me.

going on about a week since turning off transparency, which thus far has fixed the display corruption issue i've been experiencing since at least mavericks.

and since i have the iMac configured to never sleep, i'm not suffering from any of the performance lag. I'm going to set it to sleep tonight and look to use the power button as the way to wake it and see if I can save some $$$ while retaining performance without having to reboot.

I have done some more testing.

I currently have the beta for OS X 10.2. This issue is still present. If waking the Mac via keyboard or mouse after a prolonged sleep, the graphics issue still occurs.

However, with the Mac set to Wake for Network Access and with Screen Sharing turned on, if I wake the Mac by connecting to it from another using Screen Sharing, the graphics problem does not occur. So, for me, waking the Mac remotely works the same way as waking it via the Power Button. I realise this isn't really a 'quick and easy' way to wake your Mac, but maybe it sheds more light on why this is a problem to those out there who know more about the details of waking from sleep?

Macpro mid2010 16GB RAM ATI RADEON HD 5770.

Occasionally, the Apple LED 27 miniDP monitor goes totally black. Still has power, since the keyboard connected to its USB ports works. It happenes after a sleep.

The only fix is unplug the monitor and plug it again.

Also, when booting in safe mode, there are a couple of blinks with white horizontal stripes when loading the user account.

Please, file a bug report at bugreport.apple.com and send feedback about Yosemite at feedback.apple.com.

Thanks for the post. I have experienced similar distortion, and downgraded to Mavericks after coming from Snow, subsequently upgrading to Yosemite trying 10.1.

I have found that a few preference setting add ons needed updating, along with their applications, even between Mavericks & Yosemite. I removed all but Java & Flash preference settings using App Delete and (touch wood) the distortion seems to have abated.

Of course I also rebuilt the desktop and zapped the PRAM, verified the directories with TechTool, etc. I tried a clean install partition/migration, as well.

At this point (fingers crossed) I can only suggest making sure all software is both capable & updated, and would be happy to hear of others who might have managed to improve the issue... Thanks.

Just wanted to advise that Apple's 'Developer Bug Reporting Team' have come back to me on this and asked for further information and diagnostics - so at least it is being triaged and possibly investigated by them now.

...following up, no pixelation for 48 hours...

FYI specific older drivers/extensions removed included:

Nvidia CUDA (iMac has ATI Radeon 5750)

PERIAN (for quicktime formats, now discontinued)

Shades (only notes Mavericks compatibility)

Hope that helps...

two to three weeks since turning off transparency and no corrupted video, no hangs or crashes where the machine states that a graphics issue occurred. after spending $250 on a new video card, part of me is upset that i may have wasted money, but by the same token while i was in the apple store and we were running diagnostics, it did pixelate ... so i'm not sure what the graphics problem is exactly. part of me wonders if there's something deeper than just the video card that had overheated from too much world of warcraft.

still have the performance hit, however, if the mac is allowed to go to sleep and is woken up with the keyboard or mouse. keeping it set to "never sleep" so i don't have to worry about it.

I may have a pretty good workaround to this issue.

I had some problems with my MacBook pro Mid 2010 waking up from sleep under Yosemite, and some graphics distortions just like those described here. I also could not get VMWare Fusion to run properly. While the guest OS clearly booted (little thumbnail showed it did), the main guest OS screen just stayed black.

Today, I realized that the two problems may be related and that it is in fact an issue with the graphics card driver for the NVIDIA GeForce GT 330M that is in my MacBook pro. I then thought that I may fix this problem if I set Yosemite to use the internal graphics card only. I downloaded gfxCardStatus, set it to "Integrated Only", and sure enough VMWare works like a charm. Also no graphics distortions since.

I hope this helps some people here.

Gerv

I have a late 2012 iMac and after downloading Yosemite, the performance of my mac has been so slow. I've never experienced this issue before until now. I tried restarting my mac, reinstalling Yosemite, checked the "reduce transparency" box, and even adjusted how much energy my iMac uses. I wish I kept Mavericks in my time machine back up to reinstall it. If there's a way to get Mavericks back I'd be more than happy to know instead of having to stay with something unreliable.

Hey everyone - same issue, only much worse than the screenshots shown in the thread. Only thing I've found that works is to change the display resolution in System Preferences, then change it back to normal. For some reason, this seems to reset the display and all is fine without having to restart/logout/etc.