Comment 60 for bug 121439

A few additional data points:

On my notebook (Dell Latitiude D820, fully updated gutsy as of August 1 2007, kernel 2.6.22-9-generic):

The wireless kill switch trick works (documented in comments on this bug already)

 swapping out the 3945 card with an Atheros card results in NetworkManager working as expected (other than the longstanding "can't associate with hidden networks" bug).

Switching to the iwl3945 driver also results in NetworkManager working as expected (until the driver does horribly during suspend/resume)

Dropping back to the Feisty kernel (2.6.20-16-generic) also results in a working system.