Hi, I connect 3 external displays to my Macbook Pro M4 processor device, but it detects 2 of them, but it doesn't detect the 3rd one. Does anyone know the reason? My connection method is DP to Type-C for the 1st monitor, HDMI for the 2nd monitor, VGA to Type-C for the 3rd monitor, I would be glad if you could help me with the 3rd one. Thanks
[Re-Titled by Moderator]
MacBook Pro 14″, macOS 15.2
The same rules we learned for the M1 and M2 and M3 mostly still apply to the M4 models. Display interfaces are generated deep inside the system on a chip. How many there are depends on the exact type of Processor:
M3 (plain) like the 13-in and 15-in supports up to ONE External fully hardware-accelerated external display.
Except the M3 MacBook Air models with 13 or 15-in display, (and certain M3 plain MacBook Pro models when running MacOS 14.6 or later) which can support a second external display instead of the built-in display when you close the cover on the built-in display. This may require MacOS 14.6 or later.
M4 (plain) supports up to Two fully hardware-accelerated external displays (three for Mac mini)
M4 PRO processor supports up to Two fully hardware-accelerated external displays. (three for Mac mini)
M4 MAX processor supports up to Four fully hardware-accelerated external displays.
M4 ULTRA processor supports up to Eight fully hardware-accelerated external displays
Tech Specs now available here:
MacBook Pro - Tech Specs - Apple
MacBook Pro - Tech Specs - Apple
The same rules we learned for the M1 and M2 and M3 mostly still apply to the M4 models. Display interfaces are generated deep inside the system on a chip. How many there are depends on the exact type of Processor:
M3 (plain) like the 13-in and 15-in supports up to ONE External fully hardware-accelerated external display.
Except the M3 MacBook Air models with 13 or 15-in display, (and certain M3 plain MacBook Pro models when running MacOS 14.6 or later) which can support a second external display instead of the built-in display when you close the cover on the built-in display. This may require MacOS 14.6 or later.
M4 (plain) supports up to Two fully hardware-accelerated external displays (three for Mac mini)
M4 PRO processor supports up to Two fully hardware-accelerated external displays. (three for Mac mini)
M4 MAX processor supports up to Four fully hardware-accelerated external displays.
M4 ULTRA processor supports up to Eight fully hardware-accelerated external displays
Tech Specs now available here:
MacBook Pro - Tech Specs - Apple
MacBook Pro - Tech Specs - Apple
Im also having the issue whereby m4 mbp does not detect external display (dell 3223Q)
1 of 3 ports sometimes detects, the other two will not detect. No issue with hdmi. Very disappointing since my 2021 m1 pro does not have any issue.
kay-ronnie --
if you have the SAME problem, then your solution is likely posted above.
if your computer or setup differs in ANY way, To get the attention you deserve, PLEASE start a NEW discussion.
If you did not immediately find your solution by reading through the existing postings, you likely do not have "exactly the same problem" and need to explain from the beginning. This discussion is crowded with different problems posted by different users with different hardware, different versions of MacOS, and different displays.
Starting a new discussion will allow Readers to think hard about your exact situation and address the exact circumstances you are facing.
https://discussions.apple.com/post/question
MacBook Pro M4 won't detect one of the Type- C external displays
