I have Ubuntu 10.10 installed on a HP Pavilion DV2750ea. The wifi card is an Intel 4965AGN.
When I first started using Ubuntu on this laptop it connected wirelessly to the network. Then it suddenly stopped. The Wifi card power light is off and all information says the card is disabled.
When the laptop is powered on the wifi power light turns on and stays on until Ubuntu finishes loading.
I have replaced the wifi card and the wifi switch module with no change. The wifi works fine from the live CD.