Multiple Montiors Fail after Wake from Sleep . . .

Question

Multiple Montiors Fail after Wake from Sleep . . .

Throughout the years with OSX 10.x there has been issues with monitors that have popped up that could easily be fixed with clicking on the “Detect Displays” button. That button is gone and so is any easy way of fixing results of any bug. Over the past couple of weeks issues about monitors are happening at every wake from sleep. I am running several OS’s and restarting in another that has more stability where there is no issue, then rebooting back to 10.10.5 the monitors “usually” snap into “proper” resolution. Most of the time. On average I have to spend 1-2 hours per happening trying to resolve this. Recently, shutting down the machine, waiting awhile, then restarting will put everything as it should be. Most of the time.

Problem: At initial, first time of the day startup all monitors (2) are in proper position, resolution and appearance. Then after anytime during the day if the machine goes to sleep, after waking from sleep either the main monitor will not wake and the system goes into one monitor mode with the secondary monitor as main and primary; or the main monitor will come up as it should, but the secondary monitor goes into the wrong resolution with no proper resolution listing or no selection at all in the control panel. Swapping plugs on the graphics card does not really do anything. This has become a multiple time a day issue.

Hardware Specs:

Model Name: Mac Pro

Model Identifier: MacPro3,1

Processor Name: Quad-Core Intel Xeon

Processor Speed: 2.8 GHz

Number of Processors: 2

Total Number of Cores: 8

L2 Cache (per Processor): 12 MB

Memory: 8 GB

Bus Speed: 1.6 GHz

Boot ROM Version: MP31.006C.B05

SMC Version (system): 1.25f4

ATI Radeon HD 2600 XT:

Chipset Model: ATI Radeon HD 2600

Type: GPU

Bus: PCIe

Slot: Slot-1

PCIe Lane Width: x16

VRAM (Total): 256 MB

Vendor: ATI (0x1002)

Device ID: 0x9588

Revision ID: 0x0000

ROM Revision: 113-B1480A-252

EFI Driver Version: 01.00.252

Displays:

Samsung S22B150 (Secondary):

Resolution: 1920 x 1080 @ 60 Hz

Pixel Depth: 32-Bit Color (ARGB8888)

Mirror: Off

Online: Yes

Rotation: Supported

Samsung SyncMaster 2220WM (Primary):

Resolution: 1680 x 1050 @ 60 Hz

Pixel Depth: 32-Bit Color (ARGB8888)

Main Display: Yes

Mirror: Off

Online: Yes

Rotation: Supported

Posted on Jun 2, 2016 1:47 PM

Reply

Answer 1

pedro d

Community Specialist

Jun 3, 2016 5:22 PM in response to TheGuyintheProjectionBooth

Hi TheGuyintheProjectionBooth,

Thank you for using the Apple Support Communities! It sounds like you have a dual-monitor display set up with your Mac Pro, and are experiencing issues with the external displays not waking to the expected display settings from sleep.

A good place to start would be to run through the checklist provided in this article for configuring multiple displays with your Mac Pro:

Use multiple displays with your Mac Pro (Late 2013) - Apple Support

https://support.apple.com/en-us/HT202801

If you are still running into issues, there are some very helpful troubleshooting steps that can be found here, including how to reset the NVRAM and/or SMC:

Get help with video issues on external displays connected to your Mac - Apple Support

https://support.apple.com/en-us/HT201177

Appreciate you reaching out and have a great rest of your day!

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Answer 2

Jun 3, 2016 5:43 PM in response to pedro d

pedro,

Thank you for your reply. The first link does not apply to my model. I have neither Thunderbolt nor HDMI ports. Just Dual DVI. And the second link is the first thing I try when this pops up, that sometimes works. But does not work enough. Although it works better for other OS's than Yose. The main thing is that everything worked fine for a long while and then after a couple version and security updates things started to go wonky.

Thanks again! I appreciated it.

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Answer 3

chuck_3rd

Community Specialist

Jun 6, 2016 8:54 AM in response to TheGuyintheProjectionBooth

Hi TheGuyintheProjectionBooth,

Alright, that additional information is definitely helpful. It's possible that there is something configured within the Energy Saver settings and Sleep Mode in System Preferences that is causing issues. You could also try using a different DVI cable to isolate things a bit more. Due to the nature of your inquiry, you may find more information by using one of Apple's other support resources here: https://getsupport.apple.com

Thank you for being a part of the Apple Support Communities and have a lovely day!

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