Tente isto:
Edite seu arquivo iwlwifi.conf
nano /etc/modprobe.d/iwlwifi.conf
Comente as últimas três linhas e adicione isso:
options iwlwifi bt_coex_active=0 power_save=1
Seu arquivo deve terminar assim:
# /etc/modprobe.d/iwlwifi.conf
# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
# microcode file installed on the system. When removing iwlwifi, first
# remove the iwl?vm module and then iwlwifi.
#remove iwlwifi \
#(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
#&& /sbin/modprobe -r mac80211
options iwlwifi bt_coex_active=0 power_save=1
Reinicie