Mac Pro keeps logging out since El Capitan

10.11.2 installed last night and it worked for me as well ... GTX 660 and GT120.

Problem fixed too here with 10.11.2 : GTX 650 Ti Boost and GT 120 cards with one monitor linked to each of them. Everything works fine and perfect!

Just to add my experience.

The upgrade from 10.11.1 to 10.11.2 froze my computer after the Apple logo and status bar were finished.

Could not boot up in safe mode either to the login screen with 10.11.2.

In a MAC PRO I was using three monitors with an ATI Radeon HD 4870 and an ATI Radeon HD 2600.

I have replaced the ATI HD 2600 with a NVIDIA GE 120.

I have performed a clean install of 10.11.2 into a bare bones system one one hard drive.

I can now boot up into 10.11.2.

I am migrating my applications and data (no computer extensions) over from the brick drive to the booting drive.

If it doesn't boot up, I am going to suspect something else but this is looking like the same Graphic Card issue but with different cards.

I put it on a non-essential drive that I'd wiped. It promptly crashed with strobing monitors, using my two GT120 cards, maybe 45 seconds! Wanted to try Beta 5 but Apple wants $100 to download that and I don't want to pay for the problem Apple created.

Hello Eric,
Thanks for posting your experiences with 10.11.2.

I have a Mac Pro (3,1) from 2008 running a non-standard (not flashed PC) graphics card GTX660 Ti and after installing 10.11.2, the machine now boots (5 secs faster), and is stable with no login or other problems. Originally, the machine was not booting properly and had login problems after installing 10.11.0 and 10.11.1.

Note: I only have 1 video card and 1 monitor.

Thank you Apple!

Here is an update for anyone who is interested: It has been 24 hours since updating and the Mac Pro 3,1 has become almost totally unresponsive twice under 10.11.2. The first time the computer became unresponsive was after I highlighted a PDF on the desktop when Mail was open. The second time was when I was running an app named Wiki. Mail was open (and minimized) and Firefox was open also. While searching for a piece of text in the Wiki app, the computer became almost totally unresponsive.

Here is what I see: The dock disappears from the bottom of the screen, and when I open the Force Quit Application window, the window becomes unresponsive. I can use COMMAND and TAB to switch between apps, however even after the app name changes in the top left of the screen, the apps won't respond to keyboard or mouse commands.

I can move the mouse, but clicking does nothing at all. The only option I have left is to press CONTROL, OPTION, COMMAND, and SLEEP to restart the machine. When the machine restarts it seems to work fine.

I ran disk utility in El Capitan to see if there were any persistent errors, and discovered that Apple has removed several options from the latest version of Disk Utility and now leave users with a unhelpfully-simple First Aid option only. Unfortunately, when the computer becomes unresponsive, I am unable to open Application monitor, but will keep it open to see what appears when and if the computer does the same again.

I have a MacBook early 2015 model and random logouts started after upgrading to 10.11.2. It kicks me out every couple of hours. Anybody is experiencing the same behavior with Iris display cards?

To update my experience:

I was able to boot up from a clean install and also after migrating applications and data.

However, I did not migrate the computer settings.

I still see some strange things occurring but this may be due to Spotlight or some other issue I can't yet explain.

I don't have any random log outs and the system is definitely more quite with the GT 120.

However, swapping out my ATI 2600 and replacing it with my GT 120 did not help.

The brick drive is still bricked.

I am working with Apple customer support to try and help them figure this out.

I suspect some antivirus software I had installed previously that added a kernel extension (Kext) that will not let me reboot into the bricked drive.

I say this because the migration over to a clean drive would not have brought over the kernel extension.

I am guessing they will probably be able to point to something I did wrong or some software kernel extension I added.

If you are planning on doing a clean install, get a backup first to another hard drive using Superduper or carbon copy.

FIT JIM:

With my 2009 mac pro, I had to directly connect the USB plug of my Kensington track ball directly to the Mac.

Using it in serial with the keyboard did not work.

I hope this helps a little bit.

I also did a clean install and removed many of the launch agents and launch daemons from the drive library folder so the system would not start these up before the login screen.

FIT JIM:

I have a 2008 Mac Pro with a RADEON HD 5770 Mac card running 10.11.1 without problems.

I would be suspicious about the non-standard graphics card if it was not for a MAC.

They clearly had some issues with the drivers in OS X for the graphic cards and those that updated to 10.11.1.

Some of the issues were fixed with 10.11.2 but the non-Mac (PC) graphic cards may not be on their radar.

I use a non-Mac video card in my Mac Pro 2009, and an "Apple" GT120 too: no more problem since I've updated to 10.11.2.

Is it a detail? => I made a clean install of El Capitan on my Mac and never applied the alternates nVidia drivers.

10.11.0 => impossible to use 2 screens with 2 graphic cards. No matter the screens were linked each to one card or both to a single card.

10.11.1 => 2 screens both linked to one card and no problem at all. If each of the screens were linked to différent cards : system KO with logging out every 2 minutes.

10.11.2 => no matter the configuration of the screens and cards : it works. And you know what? I'm happy… ! :-)

Thanks Eric, and PJ's Pal for your messages.

Sadly, I seem to have run into problems with Finder using a non-standard graphics card with 10.11.2. The Mac worked fine, often for up to for several hours with the non-standard, non-flashed card, and then applications would stop responding and Finder would be partially responsive.

I could move windows, but not use the menus and icons (e.g. to click to activate bold in MS Word), and keyboard short cuts weren't responding either. All I could so was to reboot.

In the end, I reverted back to a 10.10.5 time machine back-up which is stable. I am happy to hear that others have had some success using non-standard cards in their Mac Pros!

I recently updated my CUDA card to the latest driver and the problem is resolved on my MAC Pro machine. I suspect it is just a matter of time before the all the graphics card manufactures get their drivers updated to resolve this issue for everyone.

Having a lot of log offs under 10.11.1 with:

Two monitors driven by NVIDIA GeForce GT 120 512 MB graphics

Model Name: Mac Pro

Model Identifier: MacPro4,1

Processor Name: Quad-Core Intel Xeon

Processor Speed: 2.26 GHz

Number of Processors: 2

Total Number of Cores: 8

L2 Cache (per Core): 256 KB

L3 Cache (per Processor): 8 MB

Memory: 16 GB

Just upgraded to 10.11.2 and using Nvidia WebDriver-346.03.04f02.

Seems to be ok for now.