Comment 53 for bug 524454

I have had this problem recently on two Dell laptops, both running Kubuntu 10.04.
In both cases, the computers locked up while suspending to RAM with a SD card in. So it may be a different or related bug.

Oddly, in one of the laptops, the problem disappeared (networking came back immediately) when the card was ejected [and this is after some power cycles] but in the other I had to search for the fix described here.