I have a Lenovo Yoga 2 Pro running 14.04 which according to dmesg has a Intel Wireless-N 7260. The wifi is not working correctly. Every 15 minutes or so it will ether get really slow or drop connection altogether. I have found many other questions about this same issue but the solution has always been to upgrade the firmware and I have the latest.
> dmesg|grep wifi
[ 2.069093] iwlwifi 0000:01:00.0: irq 60 for MSI/MSI-X
[ 2.075970] iwlwifi 0000:01:00.0: loaded firmware version 22.24.8.0 op_mode iwlmvm
[ 2.104994] iwlwifi 0000:01:00.0: Detected Intel(R) Wireless N 7260, REV=0x144
[ 2.105153] iwlwifi 0000:01:00.0: L1 Disabled; Enabling L0S