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No second screen on battery power ?

F

Foxile

macrumors regular
Original poster
Dec 27, 2007
111
0
Am I right in assuming that my MBP will switch off power to the Mini Displayport, when running on batteries ?

Well mine does, but want to make sure that's right ?
 
it won't turn it off after unplugging, but it won't start if your MBP isn't plugged in to start with.
 
toxic said:
it won't turn it off after unplugging, but it won't start if your MBP isn't plugged in to start with.
Click to expand...

Okay, I just tested it again and I run on battery, unplugged the monitor and plugged it back in and it took a bit longer (two to four and a half seconds) to actually recognise the monitor compared to when running the MBP on AC, but right now I run a second monitor while on battery.

Btw, I use a MDP to VGA adapter, if that is worth anything.
 
It'll work on battery but will drain substantially more energy.
I don't think it's normal that it switches off, but I haven't tried with 10.6.5 yet.
 
Last edited:
henry999 said:
Erm ... I don't see anything in the OP to suggest that he is talking about closed clamshell.

cheers,

Henry

____
Read the message carefully before you post
Click to expand...

Sorry, GGJ is right. I am trying to use it in a closed clamshell setup, so I can run the battery down, while using it how I do, day-to-day.
 
Foxile said:
Sorry, GGJ is right. I am trying to use it in a closed clamshell setup, so I can run the battery down, while using it how I do, day-to-day.
Click to expand...
And we were supposed to know that ... how?

The ol' rule still applies: the more information you provide, the better advice we can give.

cheers,

Henry
 
henry999 said:
And we were supposed to know that ... how?

The ol' rule still applies: the more information you provide, the better advice we can give.

cheers,

Henry
Click to expand...

In all fairness, I would expect it to provide power to the Mini Displayport, when the lid is closed, otherwise you can't use any screen at all.

I would have mentioned, if I'd thought it was pertinent.

I was hoping is was a MD fault, as I'm getting crap HDMI performance
( https://forums.macrumors.com/threads/1048660/ )
, which might have accounted for it.
 
I use my 15" i5 on battery most nights running video on a 42" HDTV using mini displayport to HDMI and it always works fine.
It does seem to use a lot more power though (understandably I suppose).
 
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