I'm on a HP-Pavillion-dv6 laptop w AMD quad-core and AMD/ATI Radeon graphics card. I dual boot 64-bit windows 7 and ubuntu 12.04, and upgraded the kernal from 3.5.0 to 3.9.7 but the wireless internet doesnt work anymore. I did rfkill list all, and nothing is blocked. When I start the computer, just before splash I get 'IRQ disabled by BIOS'.
The network controller information is 03:00.0 Network controller : Broadcom Corporation BCM43224 802.11a/b/g/n [14e4:4353] (rev 01)