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Run PowerBooks with the top closed in 10.2 System
With System 10.1, you could hit the power button then close the lid of your PowerBook and have it use only an external monitor - it would ignore the screen of the notebook. This was nice if, like me, the external monitor and the notebook are not sitting side by side.

When 10.1.5 came out this ability was lost. If you turned on the notebook with an external monitor attached, you got an extended desktop if you wanted it or not. All you could do was turn the brightness down on the PowerBook screen. However, this made it easy to loose your pointer on the blank screen.

With 10.2, things are back to the way they were in the "old" days. Now you can save that flat panel for when you don't have a tube monitor handy, extending the useful life of your PowerBook screen.
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Run PowerBooks with the top closed in 10.2 | 18 comments | Create New Account
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on 10.1.5...
Authored by: bog on Sep 06, '02 09:55:43AM

If you put the PowerBook to sleep, and then connect a display and a USB keyboard and mouse, the display will be picked up and the monitor of the powerbook is no longer used.

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on 10.1.5...
Authored by: houchin on Sep 06, '02 12:31:27PM

This started working for me with 10.1.5, but now causes crashes with 10.2 when I sleep the system and undock, so I've been back to the routine of "wake, dock, detect new displays, work, undock, detect new displays, sleep."

However, I just noticed that in 10.2, if you reduce the brightness of the LCD display until the backlight turns off, you still get display on the attached CRT. In 10.1, turning off the backlight slept the VGA output as well.

So, maybe my crashes weren't crashes, but just that the backlight was off... I'll have to look into that

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Works with iBook 2001 also
Authored by: bluehz on Sep 06, '02 12:38:41PM

Turning the LCD brightness all the way down work on iBook 2001 also. The external monitor stays active!

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not my experience
Authored by: ravedog on Sep 06, '02 10:15:58AM

im not on 10.2 yet, but am running 10.1.5 on a titanium/400 and i have always been able to power the unit up, shut the lid, and have it display to the external monitor as a single desktop. i'm not sure why u had those probs.

gee i hope i dont LOSE the ability when i switch up :P

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not my experience
Authored by: spursley on Sep 06, '02 03:48:11PM

The heading of this post should have been:

Using a PowerBook with the Lid open with the TFT display off.

Sorry I didn't make this more clear. I am not talking about using the PowerBook with the lid closed. That would do some serious damage to the TFT display over time due to the heat produced by the CPU.

I am talking about using an external monitor, with the lid of the PowerBook open (so the comments about heat dissipation are also a non-issue), and have the PowerBook use only the external display.

10.1 could do this, 10.1.5 can't do this, and 10.2 can.

With an external monitor attached and turned on, hit the power button, close the lid of the PowerBook, wait until the Mac hits the log-in screen (or the desktop for those with auto-log-in selected), you can then open the lid of the PowerBook and use the keyboard and trackpad without the PowerBook using the TFT display.

If you need both the external and TFT display after starting up this way, just choose Detect Displays and the TFT display will turn on.

Concerning the comment that the display of a Titanium PowerBook will out last the other components of the computer, this has not been my experience with TFT based displays. The TFT based displays I have used (5 so far) have had on average a much shorter usable life (brightness/color quality) than a good tube display (your millage may vary).

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not my experience
Authored by: Mitchell on Sep 06, '02 11:44:24PM

I have been using my TiBook (667) since June with 10.1.5 in clamshell mode, with the lid closed and the internal display off. This is, in fact, supported by apple..but it only works if you're on the wire, because the battery doesn't have enough mojo to run the video out card. It's in the tech note.

I use mine to drive an external LCD projector sometimes. With the projector on a little walnut inbasket turned upside down and placed over the TiBook, the installation is very tidy. With the wireless USB mouse, running presentations is extremely simple and uncluttered. And ventilation is fine, with temps monitored in the normal range.

The neat thing about 10.2 is that switching from external flatscreen at the office (1280 x 1024) to internal display or back again is now accompanieed by a sweet fade-out fade-in effect. It's much nicer that way.

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Heat dissipation
Authored by: professor on Sep 06, '02 11:34:03AM

s/extending the useful life/shortening the useful life/

Powerbooks dissipate heat by convection through the keyboard.
If you run it with the top closed, you will SERIOUSLY shorten
the life of your powerbook. Apple even issued at TechNote on this.

Under normal circumstances, a modern LCD screen will long outlast
the useful life of your 'puter (and typically will outlast a CRT monitor).

Even if you weren't liable to do serious damage to your powerbook
by running it with the top closed, "saving the LCD screen" would
not be a valid reason for doing so.

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Heat dissipation with PB G4 & Pismo
Authored by: dzurn on Sep 06, '02 06:19:29PM
Here's the tech note (updated April 2002) which specifically states that running with the clamshell closed and using an external monitor is OK for PowerBook G4 and PowerBook (FireWire) (aka Pismo) models. Although when I am using it at home I have a tiny external fan cooling it all the time, so even multi-hour work sessions don't get it warm enough to start the internal fan.

OK, multi-hour game sessions, but the computer thinks it's work! ;)

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Heat dissipation
Authored by: Nikkor on Dec 04, '02 10:40:40AM

The top only has to be closed for the wake-up. Right after that you can open it and it will stay turned off until the next wake-up.

If you want to be sure you can open the top a bit for additional cooling.

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Heat dissipation
Authored by: billfew on Jan 13, '03 07:14:10PM

According to page 47 of the owner's documents for my new 1Ghz powerbook.

Lid closed is perfectly fine and even listed as an option for operation.


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memory usage
Authored by: Sammi on Sep 07, '02 02:53:55AM

I have been closing the lid on my powerbook at startup when plugging into a crt monitor, but not for the sake of saving ym lcd as much as to be able to use the full video memory on the crt. Otherwise you are spreading the (limited amount of) video memory on the graphics chip over 2 screens.

If you open tthe lid of the powerbook after startup, the lcd will not initialise, and therefore not overhead you powerbook at all.

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Running with the top down
Authored by: n_none on Sep 07, '02 03:40:42AM

How do I stop my TiBook 667 from going to sleep whenever I put the top down in 10.2? Often I'll start a d/l, start playing an mp3, etc. and just want to put the machine under the couch and let it run. But when I put down the top it goes to sleep? Is there any way I can turn this power saver off?

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What about heat dissipation
Authored by: jnakouzi on Sep 08, '02 07:26:23AM

Will running a TiBook with the top down cause heat buildup in the CPU area?

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Not really
Authored by: stefbystef on Sep 08, '02 03:55:58PM

I have a Ti660 (early model), and when my lid is closed, I notice a slower performance on my 17" Studio Display.

Proof? Quartz Extreme is not working, even when ONLY the external Monitor is on.

So I think that the video memory is not being fully used on my external monitor. It's as if the lid is still working! Try to put a transparent terminal window above a playing DVD.

Video memory should be fully power my 17" CRT but it doesn't.
I can't even play 3D games. They act very slow. I have to unplug the VGA cable, Detect Displays, so that I can play them on my Ti Display.

Weird. Probably they don't support Quartz Extreme on External Displays.

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Not really
Authored by: rickg17 on Sep 20, '02 04:41:23PM


Your display does not have video memory. That's in the video card/adapter in your powerbook

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Heat dissipation -- monitor burnout
Authored by: Sabrina007 on Jan 20, '03 10:37:10PM

I'm wondering if its possible to run a tiBook with the top closed, if its hooked up to a "goggles" style monitor -- like that goggles-style monitor from Olympus or maybe some other sort of headsup display. I'm working on a project to make a powerbook or ibook more of a wearable computer -- its something for grad school. Any ideas? Will it really overheat and burn out my LCD if its closed but running?

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Heat dissipation -- monitor burnout
Authored by: shomann on Feb 06, '03 11:15:15AM

I personally don't have access to the type of display goggles you are talking about, but if they are seen as an external monitor then yes, it should be possible to do what you suggest.
However, if you are trying to construct a wearable computer, why not make inquiries about laptops with broken displays? You could lighten the entire rig a fair amount and offset the power requirements of the goggles. Just a thought...

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top closed while teathered
Authored by: markmark on Feb 14, '03 02:39:41AM

is it possible to teather my titanium to my nikon viq firewire while the cover is closed (like if it in my backpack?)

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