I don't have an perfect idea about that..But yes, as per my experience
may be there is something wrong from v4.0 kernels because this problem
started from the initial release of ubuntu 16.04 which came along with
the kernel v4.2...The problem was ralink wifi "disabled by
default"..when you go on to settings you find that airplaine mode is
enabled by default and you cant disable it. Even when you compile
another driver for this WIFI card somehow it shows up but still its
useless because it doesn’t detect the wifi connections nearby....because
Something is messing up with Ralink or there is some bug in kernel
itself which preventing this wifi from activating.
This problem is still present in Ubuntu and its derivatives which are
based from 16.04 to the present builds. #1745636 problem is same. the
wifi key doesn't unlocks the wifi nor even Rfkill command. I have been
filling this bug from last 2 year but still the problem exists.
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Wifi Ralink R3290 disabled by default in ubuntu 16.04
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