Comment 6 for bug 285128

I was having random hard locks too and linux-backports-modules-2.6.27-7-generic version 2.6.27-7.4 fixed it for me and made my wireless connection a lot more reliable.

But after I upgraded to version 2.6.27-7.6 from intrepid proposed the wireless was completely disabled and I had to revert back to 7.4.