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Posted by BillW50 on July 12, 2008, 1:36 pm
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Veli-Pekka Tätilä typed on Sat, 12 Jul 2008 19:14:19 +0300:
> Hi, are there laptop independent means of permanently turning off the
> screen when running on battery? How much battery life would I gain by
> doing so?
> Better yet, does Vista or Linux (X and Gnome) support running the GUI
> headless, such that the image is not drawn in the first place, and if
> done smartly, all event handling related to drawing could be skipped
> to save the CPU and battery. As long as keyboard focus handling and
> the accessibility trees of the GUI work correctly, I'm quite happy
> without the GUi ever being rendered on-screen, <smile>.
>
> That is, I'm legally blind and use the GUi from the keyboard with a
> screen reader speaking and Brailling what's going on, thus not
> needing the actual screen, since I'm the only user of the machine.
> Though I SOMETIMES use HEAVY magnification on desktop MACHINES,
> laptop screens are so hard to get very close to ergonomically, that I
> wouldn't mind killing the output totally.
> I've blanked my screen reader equipped Nokia phone's screen using
> brightness 1 and do find the battery lasting longer than with full
> brightness. So it occurred to me to ask if screen blanking can be
> done for laptops, too., and whether it is worth it if you're into
> hacks in the first place.
> If brightness is not laptop independent, howabout laptop specifics? My
> current laptop is the HP NX8220 I'm planning to run Ubuntu in after
> XP. I do find the laptop specific keyboard based brightness
> adjustment doesn't go all the way to blackness, though. My next
> laptop will be the Lenovo T61 largely due to the keyboard and quiet
> operation, so any experiences related to its screen brightness would
> be appreciated. I've read it has an app for stretching the battery
> life in Vista, so could I possibly disable the screen by tweaking
> that app's settings? I suppose Linux has more tweaking options, such
> as dummy display drivers for X, if you do know what you're doing.
> Vista's Aero has to be disabled for screen reader's anyway, as they
> hook GDI calls at the driver level.
The easiest way to hack the laptop display to be permanently is to unhook
the LCD cable from the motherboard or the video card. I don't know if the
model you have will complain or not without a display and fail to boot?
Another thing that works great, but it requires an external monitor. Is to
fire up the laptop connected to the laptop and configure the laptop to use
the display. Once the OS is loaded, you can turn off the external monitor or
even pull the VGA cable off. Once you use Standby, hibernation, or power up
again, you usually have to repeat the process.
As for saving battery power with the display off. It does, but usually like
10 to 20% longer life. Which isn't that much if you ask me. I am using an
UMPC called an Asus EEE PC with an 10400mAh battery (this size can only be
found on eBay so far) which gives me 6 to 7 hours worth of battery power. I
dunno, maybe that gives you some ideas.
--
Bill
Asus EEE PC 4GB SSD 2GB SODIMM
Windows XP Home SP2
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