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I use an Acer 4750 laptop, which has a bcm43225 wifi chip. In Ubuntu 12.04, each time I boot up, my laptop's wifi will automatically turn on, and the 12.04 use kernel 3.2 However, when I upgraded to 12.10, 13.04, using a newer kernel, I found my wifi not automatically turning on during startup. But its function is normal:I still can turn on it with Fn key.

I have experimented it, using a 3.9 kernel in Ubuntu 12.04, it was the same situation, won't turn on during boot but can be switch on with Fn key.

I have checked the rfkill list, no device was blocked

So, how do I make my wifi automatically turn on with newer kernel? It will be more convenient for me~~

Ps:I'm using bcmwl-kernel-source

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Try these

sudo apt-get remove --purge bcmwl-kernel-source

sudo apt-get install linux-firmware-nonfree

From this threaed -->
I skipped the first command and still worked.

This works for me.

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Try this commands in terminal.
sudo apt-get install linux-headers-generic
sudo apt-get install --reinstall bcmwl-kernel-source
sudo modprobe wl

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