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Old 02-13-2013, 10:39 PM   #1
anthlover
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Interesting Issue I wan into

I ran into an interesting issue I found that I could not find documented. It Appears Macbook Pro Retina 15s will not Drive 2 Monitors via its 2 thunderbolt ports unless it is plugged into AC power, despite being at 100 percent battery charge. The Video Signal shutters to life then terminates.

Plugging into AC power resolves the issue. I thought this was a bit ODD. One display did not seem to be an issue.

If it matters the displays in Question were a pair of Dell U2410 24 Inch 1920x 1200 displays connected via Mini to regular Display cables connections.

Last edited by anthlover; 02-13-2013 at 10:42 PM.
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Old 02-14-2013, 12:40 AM   #2
Marlboro Man
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The typo in the subject line led me to believe it was a networking issue…. On a more serious note, however, the behavior kind of makes sense. If you are using your macbook connected to a monitor (or two in this case), it would logically follow that there is an available power source to plug in the computer as well. I wouldn't think your laptop battery would last very long pushing two monitors that size anyway.
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Old 02-14-2013, 07:04 AM   #3
anthlover
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LOL tired when I typed that Suppose it makes sense but not very elegant interaction with the OS.
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Old 02-14-2013, 02:56 PM   #4
chabig
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I have a 2011 13" MacBook Pro. It only drives my Cinema Display when it's plugged in. If I unplug the computer, the display goes dark. I never questioned the behavior.
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Old 02-14-2013, 03:14 PM   #5
DeltaMac
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Years back, Powerbooks used to flash a message to plug in the power adapter when an external display was attached. No external video without the power adapter plugged in.
I don't think that's really a software issue.
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Old 02-14-2013, 04:22 PM   #6
anthlover
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Projectors

People use Projectors all the time off Battery Power and as I mentioned a single display was acceptable to the system.

All I meant is it would be nice if a message flashed on the screen as you said used to happen. And actually the image came on both displays very briefly and then shut off.
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Old 02-14-2013, 04:55 PM   #7
chabig
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Apple says the computer must be plugged in:

http://support.apple.com/kb/HT3131
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Old 02-14-2013, 08:12 PM   #8
anthlover
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Ty

Thank you for the link. I imagine having the lid closed was the difference in retrospect as the link indicates That with the Lid open it will do Battery for even both displays despite it not being good to leave it that way long.
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