El Capitan GTX980 - Multiple Monitors = No Boot?

[jcsnider]

I am working on my desktop build which is an X99 motherboard and i7-5820k processor (see the details on the left <--)

I just did a clean install of El Capitan 10.11.4 primarily following this guide.

Everything is working fine however when I plug in my second, or third monitor osx fails to boot and my machine restarts. All monitors, cables, and ports work, I have tested them all individually but if I plug in 2 or more at a time it will crash during boot. If I plug in the second and third monitor after boot then they work fine.

Any tips for resolving this?

Thanks,
JC

 

[jcsnider]

Hi TL,

I followed all of your directions to the letter but I do not see any change. I already had the latest Nvidia drivers, but not the CUDA so I installed those. I changed my CSR value to 0x03 to 0x67.

In my config.plist I already have nvda_drv=1, for reference I am attaching my config.plist and screenshots below.

As seen in those screenshots I have 3 working monitors, but every time I boot I must unplug 2 of them or else the machine will crash. Any other ideas?

Thanks again,
JC

 

[slim.jim]

Hi TL,

I followed all of your directions to the letter but I do not see any change. I already had the latest Nvidia drivers, but not the CUDA so I installed those. I changed my CSR value to 0x03 to 0x67.

In my config.plist I already have nvda_drv=1, for reference I am attaching my config.plist and screenshots below.

As seen in those screenshots I have 3 working monitors, but every time I boot I must unplug 2 of them or else the machine will crash. Any other ideas?

Thanks again,
JC

What kind of cable are you using to connect your monitors?

 

[jcsnider]

All three have converters, one is Dvi - > HDMI and the other two are DisplayPort -> HDMI. (Monitors only have HDMI inputs)

During boot I have tried every port on my graphics card, every cable, and every monitor combination I could think of. It doesn't matter which cable or which monitor is plugged in when I boot as long as there is only one. When I reach the login screen I can plugin the other two without issue.

Edit: Just adding a little extra information. My machine panics/reboots at the same spot that it would stop responding if I hadn't implemented fix 4 from here. When booting with one monitor, it loses signal for a moment and then recovers, where if I plug in more than one monitor, signal is lost and the machine reboots.

 

[slim.jim]

All three have converters, one is Dvi - > HDMI and the other two are DisplayPort -> HDMI. (Monitors only have HDMI inputs)

During boot I have tried every port on my graphics card, every cable, and every monitor combination I could think of. It doesn't matter which cable or which monitor is plugged in when I boot as long as there is only one. When I reach the login screen I can plugin the other two without issue.

Edit: Just adding a little extra information. My machine panics/reboots at the same spot that it would stop responding if I hadn't implemented fix 4 from here. When booting with one monitor, it loses signal for a moment and then recovers, where if I plug in more than one monitor, signal is lost and the machine reboots.

I believe you need to have active adapters or at least for the second and third monitors.

 

[jcsnider]

Is this something new/specific to El Capitan?

Yesterday it was all working beautifully with Yosemite. Only reason I upgraded was to get Xcode 7.3

 

[slim.jim]

Is this something new/specific to El Capitan?

Yesterday it was all working beautifully with Yosemite. Only reason I upgraded was to get Xcode 7.3

It is true for AMD cards not positive about Nvidia. Personally I don't have any issues booting with multiple displays but X99 systems often behave differently than Z97 systems.

 

[Jaggions]

Hello there. I'm having the same exact problem as OP. Did you figure out how to solve it? Thank you.

I'm running on an ASRock Z170 Extreme4 with a NVIDIA GTX 950 GPU.

 

[jcsnider]

Updated to the latest version of El Cap and the latest Nvida drivers back in June and it just started working again.