How To Fix Linux Wireless 54Mbps issue in 802.11ac Wireless Card

Steps

One

/etc/modprobe.d/iwlwifi.conf

options iwlwifi 11n_disable=8
options iwlwifi power_save=0

Two

/etc/modprobe.d/iwldvm.conf

options iwldvm power_scheme=1

Three

/etc/modprobe.d/iwlmvm.conf

options iwlmvm power_scheme=1