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Displays can end up entirely disabled
I've struggled with an issue that's related to this with my pBook 667. I
often use a second
monitor at one location, then sleep my machine by closing the lid, then
open it back up at a different location without a second monitor.
What sometimes happens is that the machine is "alive" but there is no active display. Connecting a second monitor doesn't work, and hitting the detect displays/mirror displays button does nada. I suspect that it has to do with screensaver mode. I have my screensaver set to require a password, and this may be blocking any attempts to detect further monitors. Sorry for the worrying without solutions, but you might want to consider this if you find your machine is suddenly working in the blind.
Displays can end up entirely disabled
Why don't you disconnect the external monitor, and then put your machine to sleep? This way when you wake it, it wont be trying to supply video to a monitor that isn't there.
Displays can end up entirely disabled
I don't know whether if it's a bug or a "Strange/Hidden Function" but you can disable all your monitors. Here's how: |
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