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LCD power off

post #1 of 13
8/21/05 at 6:31pm
Thread Starter 
I am wondering if anyone knows a way to turn off the LCD in an OS that doesn't support power saving modes? Some function key combination or something like that...?

Thanks in advance.
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post #2 of 13
8/23/05 at 5:29am
do you mean to blank it out or to turn power off to the backlight?
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post #3 of 13
8/23/05 at 12:58pm
Thread Starter 
To power off the backlight...
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post #4 of 13
8/23/05 at 11:46pm
it is possible as windows does that via its power save options. you might have to do a google search. sorry don't have a solution.
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post #5 of 13
8/24/05 at 1:39am
Thread Starter 
Quote:
Originally Posted by aussie
it is possible as windows does that via its power save options. you might have to do a google search. sorry don't have a solution.
I think Windows uses an ACPI or DPMS power off signal to shut it off. I'm looking for something that is independent of power saving features...More like the power switch on a normal monitor. I've googled but with no luck. Thanks for the input, though!
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post #6 of 13
8/24/05 at 11:02am
What happens when you shut the lid? In windows you can configure what happens when you do. The default is standby, but I've set mine to do nothing. It might be as simple as closing the lid.
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post #7 of 13
8/24/05 at 12:51pm
Thread Starter 
Unfortunately, actions from shutting the lid also depend upon power management functions in the OS.

Imagine this: You are running DOS on the laptop, and want to power off the screen alone. How would you do that?

I'm beginning to think there is no way...
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post #8 of 13
8/24/05 at 3:48pm
well, if DOS has no way to capture the close lid event, then nothing would happen and it would run as is. Closing the lid would tirgger the switch that turns off the lcd though. Have you checked the bios?
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post #9 of 13
8/24/05 at 6:30pm
Thread Starter 
Quote:
Originally Posted by gdefelice
well, if DOS has no way to capture the close lid event, then nothing would happen and it would run as is. Closing the lid would tirgger the switch that turns off the lcd though. Have you checked the bios?
I have checked the bios which is unfortunately pretty bare and offers no help.

Unless I'm very much mistaken, there is no hard-wired action associated with the lid switch, and everything is done in software. Shutting the lid does nothing for me. It could be, though, that the lid switch is broken, but I'm not sure of an easy way to test this as I do not have Windows installed on my machine.

If someone knows for a fact that the LCD backlight will shut off through a HARDWARE based process when the lid switch it tripped, could you let me know? This could probably be tested by booting into a pure dos mode or perhaps even a Windows install environment. It would at least let me know if there is a problem with my lid switch...

Thank you.
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post #10 of 13
8/24/05 at 8:16pm
Check this link out: http://www.amazinglaptops.com/8894-key.gif. In the upper right next to the power switch you can make out the close cover switch that is for the prostart8814/sager8890. I don't see what model you have, but there should be something similar for your machine.
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post #11 of 13
8/24/05 at 11:10pm
Thread Starter 
I have an 888e...the lid switch is basically the same.

My point is that I think it's not hard-coded to turn off the LCD, and that it only sends a notice to the OS saying the lid has been closed, which in turn sets the display off, or enters standby mode, or what ever else it might do. Because I have no way to test this, I was wondering if someone could assure me that it is in fact hard-coded to turn off the LCD when that switch is hit...
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post #12 of 13
8/24/05 at 11:57pm
I know when I quickly tap the white switch with my finger,the screen goes off an on, the response would indicate a hardware trigger.

What happens when you tap yours? Try tapping it when it's booting up and posting.
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post #13 of 13
8/25/05 at 2:13am
Thread Starter 
Good suggestion...about trying during post

The switch does indeed turn off the backlight during post, but does absolutely nothing once the OS has loaded. I'm not sure why...perhaps something in the OS loads that disables this behavior for some reason. Regardless, it does give me something to work with.

Thanks!
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