Re: no wireless in dell inspiron 1520 with 12.04
Had the same problem with the Inspiron 1525, till I realised that the hardware switch has to be ON at boot time, otherwise I had no wireless at all, even after turning it on and there seems to be no way to get it back from within Ubuntu without rebooting.
In other versions of Ubuntu you could turn the switch on at any time, not with 12.04. Now I have to make sure the switch is on before I hit the power button.
You may have already tried that, but though I should mention it, just in case
Dell XPS 14 Ultrabook
Intel Core i7-3517U 1.90GHz
500GB Samsung HD