You are my savior!
After last commands everything just works well
Thank you so much! Solved.

Currently I can just assume the problem is in the specific version of linux kernel.
However those versions don't work for me:
core/linux-lts 3.14.37-1
core/linux 3.19.2-1

If it's so, what particular version should I try to finally reject my doubts?

No, there is no wireless interface: $ ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group ...

$ lsmod Module Size Used by rt2800pci 5785 0 rt2800mmio 7334 1 rt2800pci rt2800lib 76739 2 rt2800pci,rt2800mmio rt2x00pci 2624 1 rt2800pci rt2x00mmio 2961 2 rt2800pci,rt2800mmio rt2x00lib 38919 5 rt2x00pci,rt2800lib,rt2800pci,rt2800mmio,rt2x00mmio mac80211 498124 3 rt2x00lib,rt2x00pci,rt2800lib ...

I tried load this one module and then all those: ...but it's still just the same.

PS: command rfkill list returns nothing.

Hello guys! Sorry, I don't speak french unfortunately. Basically I have the same problem. I am using this package: aur/mt7630-pcie-wifi-dkms 20140625-3 to get working my wifi card. I tried to use both linux kernel and linux-lts kernel with relevant linux-headers. I also tried to not apply MT7630E-3 ...