Please help with settings for Display

[cramazing]

So i got my RMBP connected to a Dell monitor, work great and all.

i have this issue that when i close my MBP and only use the monitor as display, and everything works when I have the charger plugged in.

but once i disconnect the charger, the screen goes blank and I cant use the monitor no more.

i know this is a settings issue but I can't figure it out.

you can call me stupid and tell me how to fix this haha

 

[simsaladimbamba]

This is not a settings issue, this is a missing capability. MBPs can only be used with external displays when the MBPs are connected to the power adapter, external displays cannot be used with the battery only.

But why do you want to use the MacBook Pro with Retina Display on battery, if it is stationary and can be used with the power adapter?

 

[cramazing]

This is not a settings issue, this is a missing capability. MBPs can only be used with external displays when the MBPs are connected to the power adapter, external displays cannot be used with the battery only.

But why do you want to use the MacBook Pro with Retina Display on battery, if it is stationary and can be used with the power adapter?

Really? this is currently be used on my 13"

I could have swore that i was doing this with the 15" and there was no problems, maybe Im wrong or forgetting

When i had the 15" i would unplugged the charger and it would still work..

or maybe it was unplugged and I had the mbp lid open, i really dont remember