I'd recently been having trouble with the Intel 7260 wireless card in my laptop with these kernels. There were several manifestations of the problem:
- With powersaving on the card would repeatedly drop and eventually reconnect under kernel 3.12
- With powersaving off and connected in ac mode the card would frequently (but very quickly) drop authentication, then reauthenticate with the network. This mostly manifested in the form of freezes in audio/video conversations, and was visible in dmesg.
- With powersaving off and connected in bgn mode the wireless would work pefectly for a certain amount of time, and then stop. Wireless would still show as connected, but there would be no network traffic. Fixing this required turning the network interface off and on again.
The long and short of it is, in the dir with the tarball:
tar -xvf backports-*.tar.gz
sudo make install