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intel 7265 wifi, iwlwifi and systemd

compile your kernel to support:
CONFIG_IWLWIFI=y
CONFIG_IWLMVM=y

# check which firmware version suits your kernel [1]
emerge -av iwl7265-ucode iw wpa_supplicant
# or maybe not. If your kernel want's another version, (see dmesg) (3.19 wanded the D: iwlfiwi-7265D.12.ucode) just download the correct version, unpack and move the ucode file to /usr/lib/firmware

# iwconfig is deprecated, use iw to check the wifi iface
iw dev
# ... interface wlp2p0

# manual:
wpa_supplicant -B -i wlp2p0 -c /etc/wpa_supplicant/wpa_supplicant.conf
dhcpcd wlp2p0

# or by systemd. Do not enable wpa_supplicant, it will be started by dhcpcd
#systemctl enable wpa_supplicant@wlp2p0
cat "env wpa_supplicant_driver=nl80211" >> /etc/dhcpcd.conf
systemctl enable dhcpcp@wlp2p0

# my wpa_supplicant.conf
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=wheel
update_config=1
network={
ssid="MY ESSID"
psk="MY PASS"
proto=RSN
key_mgmt=WPA-PSK
pairwise=CCMP
auth_alg=OPEN
}

[1] https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi