Q: MBP Connected to external monitor goes to sleep if power cord unplugged
I have an early 2011 MacBook Pro that is connected via Thunderbolt-to-DVI to an external Gateway monitor, working in clamshell mode. If I disconnect the power cord, either at the MBP or from the UPS, it immediately goes to sleep. Is there a fix for this? Thanks.
MacBook Pro, OS X Mavericks (10.9)
Posted on Dec 13, 2013 6:03 AM
Yeah, I 'discovered' this feature about a year and a half ago when the installer came in to hook up my new modem. I let him fiddle around a bit and my screen went blank. I checked all of the connection and could not figure out what was wrong. Then I noticed my Y adapter had come loose and the I was powered up. Plugged it back in and my Display was suddenly on again!
Just the way it works - not sure if it's documented or not!
But you've found your answer...
Clinton
Posted on Dec 13, 2013 7:15 AM