Arch Linux

jlotaco

Member

Registered: 2019-04-21

Posts: 2

[SOLVED] Can't activate interface of newly installed wifi adapter

Hello everyone.

Summary

I have recently bought a USB WiFi Adapter (TP-Link Archer T4U). I have followed the procedure outlined in this wiki page .
I have managed to install the device driver and I see that an interface has been created for the wifi adapter. However, I'm now stuck at activating said network interface and would be very glad to get some help here.

Problem

In more detail:
First I performed a complete system upgrade and then installed the rtl8812-au-dkms driver from AUR.
After inserting the kernel module with

modprobe rtl8812au

I can see that a new network interface wlp0s20u10 is created after plugging the adapter into the computer.

ip link

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    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 default qlen 1000
    link/ether 1c:b7:2c:b0:18:7d brd ff:ff:ff:ff:ff:ff
4: wlp0s20u10: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:e0:4c:88:12:00 brd ff:ff:ff:ff:ff:ff

Following the wiki, I proceeded to activate the interface which results in the following:

sudo ip link set wlp0s20u10 up

RTNETLINK answers: Operation not permitted

Is there anything else I can try? The only hint I got from other forum threads is that it could be blocked, which I don't think is the case (see rfkill output).

Logs

Below is additional output that was requested in threads of similar nature:

lsusb

lsusb

Bus 001 Device 002: ID 8087:8001 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 004: ID 2357:0115 TP-Link
Bus 002 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

dmesg

dmesg | grep rtl8812au

[    2.212369] rtl8812au: loading out-of-tree module taints kernel.
[    2.213778] rtl8812au: module verification failed: signature and/or required key missing - tainting kernel
[    2.228011] RTL871X: rtl8812au v4.3.14_13455.20150212_BTCOEX20150128-51
[    2.228012] RTL871X: rtl8812au BT-Coex version = BTCOEX20150128-51
[    2.344247] usbcore: registered new interface driver rtl8812au
[    2.347121] rtl8812au 2-2:1.0 wlp0s20u2: renamed from wlan0

iw

iw dev

phy#1
    Interface wlp0s20u10
        ifindex 4
        wdev 0x100000001
        addr 00:e0:4c:88:12:00
        type managed
        txpower 12.00 dBm

rfkill

rfkill list

1: phy1: Wireless LAN
    Soft blocked: no
    Hard blocked: no

uname

uname -r

5.0.8-arch1-1-ARCH

Last edited by jlotaco (2019-04-22 18:35:46)

seth

Member

Registered: 2012-09-03

Posts: 58,693

Re: [SOLVED] Can't activate interface of newly installed wifi adapter

https://aur.archlinux.org/packages/rtl8822bu-dkms-git/

---

How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

jlotaco

Member

Registered: 2019-04-21

Posts: 2

Re: [SOLVED] Can't activate interface of newly installed wifi adapter

https://aur.archlinux.org/packages/rtl8822bu-dkms-git/

Thank you. I installed this driver and everything worked as described in the wiki.