Yosemite: freeze + graphics problem

This is a temporary fix you can try: System Preferences > Energy Saver > Uncheck the dialogue box at the top of the window.

I've the same machine and issue. I've been to Apple and had the machine wiped as well as a new logic board. My next fix is to try a new user profile and then ask for a new machine. I've a feeling it could be profile issues after speaking to a work colleague that explained there may be some 'bad' files, that were taken form my previous machine, that are causing the hardware/software to not 'talk' properly 😟

If you live near an Apple Store, make a Genius Bar appointment to have the computer tested. Supposedly there is no charge for testing. Use 2nd link if not near an Apple Store or aren’t in the US. Hardware Repair - Keeping Confidential Data Safe

Genius Bar Reservation US

Authorized Service Provider

Done that already ... saw a genius guy today, UK store, and he ran a quick GFX test using Grapher to see if he could crash the mac with as many GFX reliant apps possible. Plugged in too.

As always, it was fine .. it didn't flinch one bit at running any of the test and they'd also ran the test the have access to too. Now that I've made it back home, I've opened the lid of the sleeping mac and surprise surprise .. it wouldn't turn on, keyboard lights on but no screen activity. Had to shutdown and back on again .. not cool

Straight up told him that if this keeps happening then I'm looking to return the machine for a lower powered one as it's clearly the Graphic's card switching that's causing the problem.

The next test I'll be doing is installing Maverick's on to a new partition and testing to see if it's OS related ... he said trying a new user profile wouldn't do anything as it's a kernel issue and it shouldn't be user related ...

To YaroslavDev

My iMac Untel 21.5 “ late 2012 (Yosemite 10.10.1) also used to freeze from time to time until a complete switch of.

The solution was not obvious :

Menu Apple > System Preferences > Security & privacy > General > Click the lock to make change > Password > Unlock > Advanced > Uncheck Log out after 10 minutes of inactivity > OK

The time was 10 minutes and checked by default after I Install Yosemite.

Enjoy,

YB24

YB24, I have that checkbox unchecked and I'm still having the same issue.

I've a feeling that the latest up date to Yosemite has fixed this issue. I've not had any GFX issues or any freezing since updating the OS! 🙂 🙂