Arch Linux

RandomNewbie

Member

Registered: 2015-11-03

Posts: 7

[SOLVED] WLAN connection problems

Hi there, I'm the new one

I'm using Arch for a few month now but after recent update my wlan interface broke.
I checked wether it was enabled or not turned out that for some reason it got disabled.
After i tried to enable it, I got this message back:

$ sudo ip link set wlp4s0 up
Cannot find device "wlp?4s0"

I also got this :

$ systemctl status netctl@wlp4s0-node.service -l
* netctl@wlp4s\xc30-node.service
   Loaded: loaded (/usr/lib/systemd/system/netctl@.service; static; vendor preset: disabled)
   Active: inactive (dead)
     Docs: man:netctl.profile(5)

Nov 03 19:55:13 tron systemd[1]: [/usr/lib/systemd/system/netctl@.service:2] String is not UTF-8 clean, ignoring assignment: Networking for netctl profile wlp4s?0/node
Nov 03 19:57:07 tron systemd[1]: [/usr/lib/systemd/system/netctl@.service:2] String is not UTF-8 clean, ignoring assignment: Networking for netctl profile wlp4s?0/node

Thanks in advance RN

Last edited by RandomNewbie (2015-12-03 21:39:27)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,803

Re: [SOLVED] WLAN connection problems

What is the output of ip addr

Also, look at the output of uname -a and of pacman -Qi linux    (post them if you wish)
Ensure that the version number of the kernel you are running (uname) matches the version that is installed (according to pacman)

Edit:  Oh, welcome to Arch Linux

Last edited by ewaller (2015-11-03 20:03:02)

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Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
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RandomNewbie

Member

Registered: 2015-11-03

Posts: 7

Re: [SOLVED] WLAN connection problems

Ok the kernel version is matching (both show 4.2.5-1)
and here is what came out of ip addr

$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 68:f7:28:4c:34:d8 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.102/24 brd 192.168.0.255 scope global enp0s25
       valid_lft forever preferred_lft forever
    inet6 fe80::1553:c34:1998:532/64 scope link 
       valid_lft forever preferred_lft forever
3: wlp4s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether d0:7e:35:8a:ca:73 brd ff:ff:ff:ff:ff:ff

*note that I'm currently running on cable.

ayekat

Member

Registered: 2011-01-17

Posts: 1,590

Re: [SOLVED] WLAN connection problems

Cannot find device "wlp?4s0"

Why is there a "?"? If I type exactly that command (I haven't got any wlp4s0 interface), I don't get any question mark there. Are you sure there is no non-printable character that sneaked into the command somehow?

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respiranto

Member

Registered: 2015-05-15

Posts: 479

Website

Re: [SOLVED] WLAN connection problems

$ sudo ip link set wlp4s0 up
Cannot find device "wlp?4s0"

Have you ever reissued this command?
It looks like somthing in the string you typed, "wlp4s0", is bad, e.g. a non-printable char has got there somewhere.

EDIT: A little too late.

Last edited by respiranto (2015-11-03 21:01:01)

RandomNewbie

Member

Registered: 2015-11-03

Posts: 7

Re: [SOLVED] WLAN connection problems

Well the original character was another it was the Placementholder Charakter (according to this site:http://apps.timwhitlock.info/unicode/in … lock-UFFF0)it didn't go into the code section. However I've manually replaced it with a "?" at the 3 spots in the wlp4s0 string. Do you think it might has something to do with a misinterpreted string due to a wrong lettercode?

respiranto

Member

Registered: 2015-05-15

Posts: 479

Website

Re: [SOLVED] WLAN connection problems

I can't imagine such a simple string as "wlp4s0" could be affected by a lettercode.
Again: Have you tried it again, the command?

RandomNewbie

Member

Registered: 2015-11-03

Posts: 7

Re: [SOLVED] WLAN connection problems

Yes I have tried the same command again the reply was: RTNETLINK answers: Operation not possible due to RF-kill

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,803

Re: [SOLVED] WLAN connection problems

what is the output of rfkill list
(Install as necessary)

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Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
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RandomNewbie

Member

Registered: 2015-11-03

Posts: 7

Re: [SOLVED] WLAN connection problems

Sorry couldn't do it earlier.

So here comes the rfkill list output :

 rfkill list
0: tpacpi_bluetooth_sw: Bluetooth
	Soft blocked: yes
	Hard blocked: no
1: phy0: Wireless LAN
	Soft blocked: yes
	Hard blocked: no

ayekat

Member

Registered: 2011-01-17

Posts: 1,590

Re: [SOLVED] WLAN connection problems

Is is a laptop? Usually there is Fn+F<something> that acts as a "WiFi button", i.e. soft-blocking the WiFi interface. Is there any such button, and might it be that you have pressed it by accident?

EDIT It may also just be a dedicated button, of course

Last edited by ayekat (2015-11-05 18:41:05)

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pkgs │ hacks │ cfg │ blag

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,803

Re: [SOLVED] WLAN connection problems

Yeah, you are blocked for some reason.   Try rfkill unblock 1
That will work because you are soft blocked.  Hard blocks require you move a switch or perform keystrokes (as suggested by ayekat).  Some machines, those keystrokes are a soft (logical) block.  Others they are a hard (physical) lock.

BTW, Bluetooth is soft blocked too.  It is index 1 instead of 0.

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

RandomNewbie

Member

Registered: 2015-11-03

Posts: 7

Re: [SOLVED] WLAN connection problems

Oh my god. Thanks alot yes actually it was a software latched key right next to F5. -.- Must have hit it while debugging. Darn.
Well thanks alot guys. At least I learned about a new tool on the way.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,803

Re: [SOLVED] WLAN connection problems

Glad it is working. Be sure to edit your first post and change the title be prepending [SOLVED].  We ask that you do it as only your know when it really is solved.

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

RandomNewbie

Member

Registered: 2015-11-03

Posts: 7

Re: [SOLVED] WLAN connection problems

Hi there, I´m again having trouble connecting via WLAN. When entering systemctl --failed it says dhcpcd@wlp4s0.service is loaded but but failed on active and sub. When I try to restart it I'm getting the error msg:

Failed to open /run/systemd/ask-password-block/136:0: Permission denied
Job for dhcpcd@wlp4s0.service failed because the control process exited with error code. See "systemctl status dhcpcd@wlp4s0.service" and "journalctl -xe" for details.

The journalctl -xe output says something like this:

Dec 02 ...[5581]: wlp4s0: starting wpa_supplicant
Dec 02 ...[5584]: wlp4s0: failed to start wpa_supplicant
Dec 02 ...[5585]: wlp4s0: Successflly initialized wpa_supplicant
                          Line 1182: unknown EAP method 'SIM'
                          You may need to add support for this EAP method during wpa_supplicant
                          build time configuration.
                          See README for more information.
                          Line 1182: failed to parse eap 'SIM'
                          Line 1185: failed to parse network block.
                          Line 1192: unknown EAP method 'PSK'
                          You may need to add support for this EAP method during wpa_supplicant
                          build time configuration.
                          See README for more information.
                          Line 1192: failed to parse eap 'PSK'
                          Line 1196: failed to parse network block.
                          Line 1228: unknown EAP method 'IKEV2'
                          You may need to add support for this EAP method during wpa_supplicant
                          build time configuration.
                          See README for more information.
                          Line 1228: failed to parse eap 'IKEV2'
                          Line 1231: failed to parse network block.
                          Failed to read or parse configuration '/etc/wpa_supplicant/wpa_supplicant.conf'.

Btw how do i mark this thread as solved once it is solved? greetings RN

LCvanDinteren

Member

From: Netherlands

Registered: 2015-10-27

Posts: 153

Re: [SOLVED] WLAN connection problems

Glad it is working. Be sure to edit your first post and change the title be prepending [SOLVED].  We ask that you do it as only your know when it really is solved.

Btw how do i mark this thread as solved once it is solved? greetings RN

Go to your first post, hit the EDIT button, edit the title.