Disable built-in WiFi card so that USB WiFi device gets used.

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I have a Toshiba Satellite L850 Laptop for which the WiFi card appears to be incompatible with any drivers available for Linux. To try to get around this problem I recently purchased a USB WiFi device: An ASUS USB-N110. They (ASUS) provide drivers which one must install. After a great deal of travail and fumbling around (the instructions were both unclear --- apparently written by someone for whom English was at best a *third* language ---
and slightly misleading) I managed to get the device *partially* working.

The device appears to work immediately after boot-up but if I close the lid of my laptop, (which causes it to go into hibernation (???) mode) or if I log out and log back in, the WiFi connection gets lost. When I try to restore the connection it seems to keep trying to use the WiFi card that is built into the laptop rather than the USB WiFi device. (And the built-in device doesn't work; as I said, its drivers are incompatible with Linux OSes. Which is why I bought the USN-N10 in the first place.) The only way to get the laptop to make use of the USB WiFi device seems to be to shut down and restart. This is unsatisfactory.

Is there any way to "disable" the (non-functional) built-in WiFi card so that the laptop will *not* try to use it but will rather go straight to the (functional) USB device? I Googled around a bit and found some instructions for disabling the built-in WiFi card under Ubuntu, but these instruction did not (as far as I could tell) mesh with the Fedora system that I am
running.  Can anyone tell me how to do what I want under Fedora?

If you reply, ***PLEASE*** be as clear and explicit as you possibly can. I am not terribly swift with OS matters. I know and understand ***some*** things, but there are huge
lacunae in my knowledge.

I am running Fedora 17; output of "uname -a" is:

Linux localhost.localdomain 3.3.4-5.fc17.x86_64 #1 SMP Mon May 7 17:29:34 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Thanks for any help that anyone can give me.


        Rolf Turner

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