When I powered the Raspberry Pi 3B on (I use Gentoo), WiFi was working. After reboot, it stopped working, both
ip link list and
ifconfig commands do not list it (they do if WiFi is working).
I am experimenting a bit, after some reboots it was working, sometimes not.
I think it could be caused by power supply that not enough (it is only 2A). When I was using Raspbian, WiFi was working without problems with the same supply.
I tried to reboot (
shutdown -r now) 6 times, 5 times it was OK.
When I tusrned it off (
shutdown -h now) and reconnected supply 6 times, it was OK only 2 times.
What can cause this problem?