Intrepid Ibex comes with the Broadcom STA driver which has wl.ko module but ssb and b43 modules r loaded..
Add folowing lines to /etc/modprobe.d/blacklist
Reboot and check if your wifi is working or not .
If not (and the modules still got loaded into memory)
delete following modules
/lib/modules/’uname -r ‘/kernel/drivers/ssb/ssb.ko
/lib/modules/’uname -r ‘/kernel/drivers/net/wireless/b43/b43.ko