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Re: How to turn off internal monitor when using external one

Gerardo Ballabio wrote:

Hi all,

I've been given a Dell Latitude C640 laptop as my work PC (it was formerly used by my boss, who ran Windows). When in the office, I plug it into its docking station under my desk and use external LCD monitor, keyboard and mouse. I run Sarge, kernel 2.6.8-1-686.

My problem is, when it's plugged in, the internal monitor is blank (which is fine for me) but on, regardless whether the lid is open or closed, and that heats the laptop quite a lot, especially since I usually keep it closed. A colleague told me she used to have the same problem, and her motherboard burned after some months; after that she switched back to Windows.

However if I switch to the text console (even if X is running in the background), the internal monitor does turn off. Thus I suspect it could be a problem of configuring X correctly. I guess that I should somehow tell X that I have two distinct monitors, and want to use only one of them. But I don't know how to do that.

Anybody could help me?

If you are using a radeon driver, do a man radeon and look for "Panel Off". I added that line to my XFree86 config file, and it worked beautifully.

Jason Martens

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