I am no expert, but Mint13's Update kills wifi (Atheros, Broadcom, etc...) and touchpads.
I installed LM13 on my netbook and my wifi worked perfectly for over half a year (I work in crazy locations with minimal wifi, so updating hundreds of files is unthinkable - this forum barely loads). The moment I rebooted after letting LM13 "Update" (I went home where wifi is "normal"), my wifi AND my touchpad did not show as devices or modules. I re-installed LM13, disabled auto-update and will wait for LM15 to make the fix. I don't think anyone who can make changes listens to little people like me, so I look for my own (imperfect) solutions.
I dual-boot Windows (sorry... I need it so I can use Rosetta Stone and a few Windows-only apps), and my wifi and touchpad work normally... so all the "are you sure it works?" questions pushed me make my final (imperfect but functional) decision. Disabled AutoUpdate.
sudo rm /etc/modprobe.d/blacklist-bcm43.conf
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