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Second external display goes black after a few seconds

So I have a MacBook Pro (15-inch, 2016) running Mojave 10.14.6 with a Radeon Pro 455 2 GB Intel HD Graphics 530 1536 MB.


Im using twi displays with it :


One is an Apple display that is working just fine. Here is the system info:


**Thunderbolt Display:**

Display Type: LCD

Resolution: 2560 x 1440 (QHD/WQHD - Wide Quad High Definition)

UI Looks like: 2560 x 1440

Framebuffer Depth: 30-Bit Color (ARGB2101010

)Display Serial Number: C02M20KEF2GC

Mirror: Off

Online: Yes

Rotation: Supported

Automatically Adjust Brightness: No

Connection Type: DisplayPort


The other is a Samsung SyncMaster 940b, Her is the system info also:


**SyncMaster:**

Resolution: 1024 x 1280

UI Looks like: 1024 x 1280 @ 60 Hz

Framebuffer Depth: 30-Bit Color (ARGB2101010)

Display Serial Number: HXCLB03121Mirror: Off

Online: Yes

Rotation: 90

Automatically Adjust Brightness: No

Connection Type: DVI or HDMI

Adapter Firmware Version: 0.00


The problem is the syncmaster goes black after a few seconds and it is still detected by my Mac. I'm using a dvi to usb-c conector with it. I tried many solutions that I found on-line but none has worked. I'm thinking this has to do with the monitor being to old generating some driver compatibility issue.


Please help!


Thanks in advance

MacBook Pro 15", macOS 10.12

Posted on May 2, 2020 12:27 PM

Reply
Question marked as Top-ranking reply

Posted on May 3, 2020 10:29 AM

leifwm wrote:

So I have a MacBook Pro (15-inch, 2016) running Mojave 10.14.6 with a Radeon Pro 455 2 GB Intel HD Graphics 530 1536 MB.

Im using twi displays with it :

One is an Apple display that is working just fine. Here is the system info:

**Thunderbolt Display:**
Display Type: LCD
Resolution: 2560 x 1440 (QHD/WQHD - Wide Quad High Definition)
UI Looks like: 2560 x 1440
Framebuffer Depth: 30-Bit Color (ARGB2101010
)Display Serial Number: C02M20KEF2GC
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: No
Connection Type: DisplayPort

The other is a Samsung SyncMaster 940b, Her is the system info also:

**SyncMaster:**
Resolution: 1024 x 1280
UI Looks like: 1024 x 1280 @ 60 Hz
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Display Serial Number: HXCLB03121Mirror: Off
Online: Yes
Rotation: 90
Automatically Adjust Brightness: No
Connection Type: DVI or HDMI
Adapter Firmware Version: 0.00

The problem is the syncmaster goes black after a few seconds and it is still detected by my Mac. I'm using a dvi to usb-c conector with it. I tried many solutions that I found on-line but none has worked. I'm thinking this has to do with the monitor being to old generating some driver compatibility issue.

Please help!

Thanks in advance



In General, you must make the connection from output to display input in at most one single adapter; in most cases, you can not stack adapters.


Get help with video issues on external displays connected to your Mac - Apple Support
 https://support.apple.com/en-us/HT201177



See— for display numbers and compatibility

https://discussions.apple.com/thread/250115199?answerId=250211154022#250211154022




Less is needed to run a DisplayPort family or Thunderbolt Display than an HDMI display.

ref: https://discussions.apple.com/thread/250925829?answerId=251758918022#251758918022






Similar questions

1 reply
Question marked as Top-ranking reply

May 3, 2020 10:29 AM in response to leifwm

leifwm wrote:

So I have a MacBook Pro (15-inch, 2016) running Mojave 10.14.6 with a Radeon Pro 455 2 GB Intel HD Graphics 530 1536 MB.

Im using twi displays with it :

One is an Apple display that is working just fine. Here is the system info:

**Thunderbolt Display:**
Display Type: LCD
Resolution: 2560 x 1440 (QHD/WQHD - Wide Quad High Definition)
UI Looks like: 2560 x 1440
Framebuffer Depth: 30-Bit Color (ARGB2101010
)Display Serial Number: C02M20KEF2GC
Mirror: Off
Online: Yes
Rotation: Supported
Automatically Adjust Brightness: No
Connection Type: DisplayPort

The other is a Samsung SyncMaster 940b, Her is the system info also:

**SyncMaster:**
Resolution: 1024 x 1280
UI Looks like: 1024 x 1280 @ 60 Hz
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Display Serial Number: HXCLB03121Mirror: Off
Online: Yes
Rotation: 90
Automatically Adjust Brightness: No
Connection Type: DVI or HDMI
Adapter Firmware Version: 0.00

The problem is the syncmaster goes black after a few seconds and it is still detected by my Mac. I'm using a dvi to usb-c conector with it. I tried many solutions that I found on-line but none has worked. I'm thinking this has to do with the monitor being to old generating some driver compatibility issue.

Please help!

Thanks in advance



In General, you must make the connection from output to display input in at most one single adapter; in most cases, you can not stack adapters.


Get help with video issues on external displays connected to your Mac - Apple Support
 https://support.apple.com/en-us/HT201177



See— for display numbers and compatibility

https://discussions.apple.com/thread/250115199?answerId=250211154022#250211154022




Less is needed to run a DisplayPort family or Thunderbolt Display than an HDMI display.

ref: https://discussions.apple.com/thread/250925829?answerId=251758918022#251758918022






Second external display goes black after a few seconds

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