I have a Macbook with a bcm4331 wireless chip that has not been supported in Linux. The driver was added to kernel 3.2. I was anxious to test this when I upgraded to precise.
After the update there was no net connection. The network indicator said “Missing firmware”. So I scoured the net and found the steps necessary to extract the firmware file to the correct directory.
I typed the command and pressed enter. That exact second my network indicator started blinking and a few seconds later it had connected.
Without any configuration, kernel module unloading/loading or “refresh state” button prodding.
It just worked. Automatically. As it should. And even before it worked it gave a sensible and correct error message.
To whoever coded this functionality: I salute you.