Instale o driver mais recente em aqui
wget https://wireless.wiki.kernel.org/_media/en/users/drivers/iwlwifi-7265-ucode-16.242414.0.tgz
tar xvf iwlwifi-7265-ucode-16.242414.0.tgz
cd iwlwifi-7265-ucode-16.242414.0
cp iwlwifi-*.ucode /lib/firmware
Reinicie
Descarregar e carregar o driver:
rmmod iwlwifi
modprobe iwlwifi
Ou você pode usar backports:
wget https://www.kernel.org/pub/linux/kernel/projects/backports/stable/v4.4.2/backports-4.4.2-1.tar.gz
tar xvf backports-4.4.2-1.tar.gz
cd backports-4.4.2-1
make defconfig-iwlwifi
make
sudo make install
Reinicie e recarregue o driver.