MacBook Pro display doesn't turn on when HDMI is plugged in on cold boot

[RedOctober]

I wonder if this issue is found in the MBPr 15" with iGPU as well....

 

[zambz]

I wonder if this issue is found in the MBPr 15" with iGPU as well....

Good question, I wonder if disconnecting my MBP from power would simulate the same test with the Intel GPU. I may give it a try this evening

 

[Tankmaze]

Hey guys, got some good and bad news. I got a call back from Apple today. Their engineers have been able to successfully reproduce this problem and it affects the current generation of MacBook Pros. It's apparently likely related to the graphics card.

I've been advised that a fix may be made available in a software update in the future that repairs it.

So i'm curious because I have the same machine as you, Mbp 15" with AMD. And I tested cold boot both with minidp-dvi in the TB port and also the hdmi port and yes the internal display won't turn on,
I had to close the lid and open it again to "detect" the display.

I'm actually liking this as I can have my mac open without closing the screen in clamshell mode. But then again the mac takes air from the bottom.

 

[zambz]

Good news folks, Apple completely fixed this with the El Capitan release!

 

[RedOctober]

Great news, thanks zambz!