Q: Mac Pro keeps logging out since El Capitan

So far so good with the new drivers just installed them and running the browser and other software in the 2nd monitor.  Knock on wood

I can't even get the new web driver to load.  After install and restart a dialogue pops up and says Unable to open Nvidia driver Manager.  Please reinstall etc and try again.  After several attempts Ive uninstalled the web driver and went back to the standard drivers with only 2 monitors.

I installed the new Nvidia Web Drivers and used than and still no problem on 10.11.1 with one 120 GTX and a PC 5770, one monitor on each card and use Separate Spaces checked.

I installed the new drivers with Separate Spaces unchecked and it eventually logged me out working on the 2nd Monitor.  I logged back in and checked Separate Spaces so we shall see.

I'm on 10.11.1 official with an Apple GT120 and an Apple Radeon 5770. I just updated the nVidia drivers to 346.03.03f01 and rebooted. Plugged in my fourth monitor (24" single-link) to the GT120's DVI port and it took only about 60 seconds for it to crash. So, I don't think the problem is resolved.

Note that I caved and bought an Apple Radeon 5770 card to put in my machine so that I can drive three (of my four) monitors with just that card (so I'm at 75% instead of 50%). The Radeon seems plenty solid, and as has been mentioned before, it's plugging anything into a second nVidia card that triggers the problem.

Out of curiosity, what kind of ports are people using? Any chance it's related to DVI vs. Mini-DP? I wonder if the people who aren't having as much trouble are all using one kind of port?

Another question: I'm on a 4,1 that I upgraded to a 5,1 (firmware) so I could put in a six-core chip. I assume some of the many people on this post are still running 100% OEM configurations?

Mine are DVI 30" Apple Cinema HD Monitors connected to the NVIDIA GeForce GT 120 512 MB cards

Yup the NVIDIA update didn't not solve the issue.  I just rebooted my machine to make sure I rebooted and as soon as I logged in, had no windows open and after a couple seconds I was logged out.  Back to using just the main monitor till this gets solved.  Irritating.

This morning I was logged out. When I logged back in I was quickly logged out again.

I tried using the Mac drivers but still got logged out. Try unchecking Use Separate Spaces but same problem. Went back to Nvidia drivers and OK at least for now.

GT 120 and PC 5770 with one monitor on each card.

Had same issue My mac:

Mac Pro 4.1 2 x 2.93 GHz Quad-Core Intel Xeon

32 GB 1066 MHz DDR3 ECC

2 x Nvidia GeForce GT 120 video cards

4 Displays

switched to:

1 x Nvidia GeForce GT 120 video card

1 x Apple ATI Radeon HD5770

Still would crash to login

Fix that worked for know: No boot screen

Non Apple NVIDIA NVS 510 2048 MB

Hi guys,

I've spent almost one week at the phone with the apple care service in Europe. A very nice guy helped me a lot and is trying to understand this bug.

He told me that they want to solve this problem with the engineers. To do so, every days they called me to do something new to do in order to find the origin of the bug. We have done the reset of SMC, the thing with PRAM, screen captures of the console, going back to Yosemite, and going to EC again etc.

Today, the apple care service called me and made me write a special command in the terminal,  then they sent me an apple program to capture data at the moment the computer crash, and it has crashed.... I've sent them a lot of informations to give to the apple engineers so they can make an update or a patch. They also told me that they have read this discussion and they'll try to do their best.

They should call me on monday, the 2nd of november 2.30 Pm, Paris time,  if  I can get more informations and specially a solution i'll be glad to give it to you here.

My mac pro is a late 2009 4.1, with to GT120 and 2 apple displays 24".

Hope it'll work

What a good news, thanks for the feeback, zenondelay

Did you install the the NVS 510? Are you using two display ports for the ACER Monitors?

Yes I installed the NVS 510 card has 4 Mini DisplayPort 1.2, Using:

Philips FTV 48" TV mini dp to hdmi cable

Acer H236HL Apple MiniDP to DVI Adapter X 2

VGA DisplaySamsung 24" Apple MiniDP to VGA Adapter, but orders 2nd mini dp to hdmi cable.

Salut Zenondelay,

Juste pour info, j'ai aussi été en contact avec Apple, exactement dans les mêmes conditions que toi, avec rigoureusement les mêmes procédures de tests, essais en tous genres, suivi téléphonique, par mail, captures, promesses d'engagement, etc. pour un autre problème que celui qui nous intéresse dans ce fil.

Ça n'a débouché sur rien.

Donc espérons qu'ils soient plus efficaces cette fois !

For non-French people, all I'm saying to Zenondelay is that the way Apple-France-Europe treats the problem is absolutely NOT a guaranty to get a fix. I've been in contact with them, just as Zenondelay is, for another problem and it has never been fixed. French and European engineers do refer to Apple-US: they can only wait for these people to find a solution. Let's pray, brothers! ^_^

To the extent that it helps anyone, I've had the same problem 2 x cinema display w/ 2 x GT120 on a Mac Pro.  I bugged this issue against my Dev account back on 1 Oct.  They closed my bug as a duplicate of another report.  Since there's no visibility of someone else's bug report, there's no way for the end user to validate that it's the same issue ... just have to assume that they have correctly identified it as the same.  Also, end users can't see the text or any back and forth on that other bug, the only item that shows up is that it's still "Open". So no fix in 10.11.1 :-(

If there's any upside, presumably, there's a known issue, and at some point perhaps the bug will be fixed by development. I'm with everyone else with the level of frustration.  Especially as it seems like this was a problem with Mountain Lion (Mountain Lion keeps logging user out...) which was ultimately resolved.