Powerbooks, External Displays, and VRAM

lorkp

macrumors member
Original poster
Apr 27, 2005
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0
From what I've read, I can see that a Powerbook's available VRAM will split between the built-in display and the external display when an external display is attached. Here's my question though: Will the external display use all of the available VRAM if the Powerbook is run in lid-closed mode?
 

Mechcozmo

macrumors 603
Jul 17, 2004
5,215
2
If the PowerBook is in "clamshell" mode, then yes, the external display will use all the VRAM.
 

.Andy

macrumors 68030
Jul 18, 2004
2,946
583
The Mergui Archipelago
Chef Medeski said:
In clamshell mode, can you hook up two monitors to the Powerbook to really increase Real Estate.
How do you do that with only one DVI port?

I was playing today and splitting the 64MB card between the two displays (inbuilt and 20"ACD) works wonderfully. You get all the eye-candy goodness (like the ripple effect etc on both screens) and there doesn't seem to be any noticeable slowdown. I'd imagine the 128MB cards would drive the displays wonderfully though :).
 

zach

macrumors 65816
Feb 14, 2003
1,205
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Medford
If you're willing to use SVideo out, I think there's actually a hack to allow two external displays.
 

Earendil

macrumors 68000
Oct 27, 2003
1,546
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Washington
Over Achiever said:
There's also a PC Video card that has DVI output (even dual DVI outputs) so you can add 1 or 2 LCDs to the powerbook, in addition to the DVI out. I forget the link, but it uses a card with 32 MB video memory.
Find that link, please!
 

Chef Medeski

macrumors 6502a
Jun 14, 2005
983
0
New York, NY
Ohhh thats a bummer. The only good aspects of a Powerbook aren't available on a 12", that really sucks. But probably udnerstandable considering their size. I don't know if they have room to fit much more without it overheating.
 

.Andy

macrumors 68030
Jul 18, 2004
2,946
583
The Mergui Archipelago
Chef Medeski said:
Ohhh thats a bummer. The only good aspects of a Powerbook aren't available on a 12", that really sucks. But probably udnerstandable considering their size. I don't know if they have room to fit much more without it overheating.
Apple do sell a mini DVI to Video adapter at the store that will do that though. It's mini DVI to composite or S-video :)

edited as I was totally wrong about there not being a powerbook adapter :eek:.
 

ITASOR

macrumors 601
Mar 20, 2005
4,400
3
I wish there was a way to turn the iBook screen off to let the hack give all the VRAM to the external monitor. That guy should put that in his hack. I don't like clamshell mode. :(
 

wwooden

macrumors 68000
Jul 26, 2004
1,995
145
Burlington, VT
ITASOR said:
I wish there was a way to turn the iBook screen off to let the hack give all the VRAM to the external monitor. That guy should put that in his hack. I don't like clamshell mode. :(
Can you run clamshell mode with the hack on an iBook? Because with my powerbook I can start the clamshell mode, give all the VRAM to the external display, then lift the screen on the powerbook and it will stay completely black and turned off. If you can run clamshell, I don't see why this wouldn't work.