Plase add below commit to 4.19, it fixes monitor mode and starting connection to AP. commit 473f0a763d2c7cd68a6dedf51e7d81e8f58f78ac Author: Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx> Date: Fri Sep 7 23:13:12 2018 +0200 mt76x0: run vco calibration for each channel configuration Thanks Stanislaw