Linux Mint(17.1) only my wifi network is not visible.

[blizzard]

Hi All,
I have Dell Inspiron N5010 and Asus RT-N10E router( http://www.asus.com/Networking/RTN10E/specifications/ ). I face a very weird problem, my wifi network is not at all visible in Linux Mint, but it works fine in Windows-7(Dual boot Mode) and in my mobile.

I tried changing different configurations in router such as channel, security(WPA/WPA2), Access Point mode etc., Resetted the router, tried wicd but no success.
Please find the output of wireless-info script:

Code: Select all

########## wireless info START ##########

Report from: 14 Mar 2015 04:45 IST +0530

Booted last: 14 Mar 2015 03:09 IST +0530

Script from: 20 Sep 2014 23:04 UTC +0000

##### release ###########################

Distributor ID:	LinuxMint
Description:	Linux Mint 17.1 Rebecca
Release:	17.1
Codename:	rebecca

##### kernel ############################

Linux 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Parameters: ro, quiet, splash, vt.handoff=7

##### desktop ###########################

default

##### lspci #############################

12:00.0 Network controller [0280]: Intel Corporation Centrino Wireless-N 1000 [Condor Peak] [8086:0083]
	Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN [8086:1325]
	Kernel driver in use: iwlwifi

13:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 02)
	Subsystem: Dell Device [1028:0447]
	Kernel driver in use: r8169

##### lsusb #############################

Bus 002 Device 005: ID 413c:8162 Dell Computer Corp. Integrated Touchpad [Synaptics]
Bus 002 Device 004: ID 413c:8161 Dell Computer Corp. Integrated Keyboard
Bus 002 Device 003: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0c45:6461 Microdia 
Bus 001 Device 004: ID 0458:003a KYE Systems Corp. (Mouse Systems) NetScroll+ Mini Traveler / Genius NetScroll 120
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

##### PCMCIA card info ##################

##### rfkill ############################

0: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no

##### lsmod #############################

iwldvm                232285  0 
mac80211              630653  1 iwldvm
iwlwifi               169932  1 iwldvm
dell_wmi               12761  0 
sparse_keymap          13948  1 dell_wmi
cfg80211              484040  3 iwlwifi,mac80211,iwldvm
dell_laptop            18168  0 
dcdbas                 14928  1 dell_laptop
wmi                    19177  1 dell_wmi

##### interfaces ########################

auto lo
iface lo inet loopback

##### ifconfig ##########################

eth0      Link encap:Ethernet  HWaddr <MAC 'eth0' [IF]>  
          inet addr:10.251.147.173  Bcast:10.251.255.255  Mask:255.255.0.0
          inet6 addr: fe80::f24d:a2ff:fec1:ded5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:21478 errors:0 dropped:1 overruns:0 frame:0
          TX packets:17689 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:20756311 (20.7 MB)  TX bytes:2926971 (2.9 MB)

wlan0     Link encap:Ethernet  HWaddr <MAC 'wlan0' [IF]>  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

##### iwconfig ##########################

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=14 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          

##### route #############################

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.251.0.1      0.0.0.0         UG    0      0        0 eth0
10.251.0.0      0.0.0.0         255.255.0.0     U     1      0        0 eth0

##### resolv.conf #######################

nameserver 202.83.21.24
nameserver 202.83.23.83
nameserver 127.0.1.1

##### nm-tool ###########################

NetworkManager Tool

State: connected (global)

- Device: eth0  [Wired connection 1] -------------------------------------------
  Type:              Wired
  Driver:            r8169
  State:             connected
  Default:           yes
  HW Address:        <MAC 'eth0' [IF]>

  Capabilities:
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Properties
    Carrier:         on

  IPv4 Settings:
    Address:         10.251.147.173
    Prefix:          16 (255.255.0.0)
    Gateway:         10.251.0.1

    DNS:             202.83.21.24
    DNS:             202.83.23.83

- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            iwlwifi
  State:             disconnected
  Default:           no
  HW Address:        <MAC 'wlan0' [IF]>

  Capabilities:

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points 
    belkin.3b6c:     Infra, <MAC 'belkin.3b6c' [AC3]>, Freq 2427 MHz, Rate 54 Mb/s, Strength 79 WPA WPA2
    hemalatha:       Infra, <MAC 'hemalatha' [AC1]>, Freq 2427 MHz, Rate 54 Mb/s, Strength 45 WPA WPA2
    Jertel:          Infra, <MAC 'Jertel' [AC2]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 35 WEP
    Viru$$:          Infra, <MAC 'Viru$$' [AN4]>, Freq 2437 MHz, Rate 54 Mb/s, Strength 19 WPA2
    ashok !:         Infra, <MAC 'ashok !' [AN5]>, Freq 2422 MHz, Rate 54 Mb/s, Strength 29 WPA2
    SHARANSS:        Infra, <MAC 'SHARANSS' [AN6]>, Freq 2462 MHz, Rate 54 Mb/s, Strength 15 WPA2

##### NetworkManager.state ##############

[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true

##### NetworkManager.conf ###############

[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq

[ifupdown]
managed=false

##### NetworkManager profiles ###########

##### iw reg get ########################

Region: Asia/Kolkata (based on set time zone)

country 00:
	(2402 - 2472 @ 40), (3, 20)
	(2457 - 2482 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
	(2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
	(5170 - 5250 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS
	(5735 - 5835 @ 40), (3, 20), PASSIVE-SCAN, NO-IBSS

##### iwlist channels ###################

eth0      no frequency information.

lo        no frequency information.

wlan0     13 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz

##### iwlist scan #######################

Channel occupancy:

      2   APs on   Frequency:2.427 GHz (Channel 4)
      1   APs on   Frequency:2.462 GHz (Channel 11)
      2   APs on   Frequency:2.472 GHz (Channel 13)

eth0      Interface doesn't support scanning.

lo        Interface doesn't support scanning.

wlan0     Scan completed :
          Cell 01 - Address: <MAC 'hemalatha' [AC1]>
                    Channel:4
                    Frequency:2.427 GHz (Channel 4)
                    Quality=31/70  Signal level=-79 dBm  
                    Encryption key:on
                    ESSID:"hemalatha"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=0000000412a952a8
                    Extra: Last beacon: 44ms ago
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
          Cell 02 - Address: <MAC 'Jertel' [AC2]>
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=31/70  Signal level=-79 dBm  
                    Encryption key:on
                    ESSID:"Jertel"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
                              18 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=0000000e530007d3
                    Extra: Last beacon: 44ms ago
          Cell 03 - Address: <MAC 'belkin.3b6c' [AC3]>
                    Channel:4
                    Frequency:2.427 GHz (Channel 4)
                    Quality=55/70  Signal level=-55 dBm  
                    Encryption key:on
                    ESSID:"belkin.3b6c"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=00000005c4d36e21
                    Extra: Last beacon: 44ms ago
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    IE: WPA Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
          Cell 04 - Address: <MAC 'Ananya' [AC4]>
                    Channel:13
                    Frequency:2.472 GHz (Channel 13)
                    Quality=21/70  Signal level=-89 dBm  
                    Encryption key:on
                    ESSID:"Ananya"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
                              18 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=00000005ae42a176
                    Extra: Last beacon: 80ms ago
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
          Cell 05 - Address: <MAC 'MGMNT' [AC5]>
                    Channel:13
                    Frequency:2.472 GHz (Channel 13)
                    Quality=21/70  Signal level=-89 dBm  
                    Encryption key:on
                    ESSID:"MGMNT"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
                              18 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=00000005ae42a988
                    Extra: Last beacon: 76ms ago

##### module infos ######################

[iwldvm]
filename:       /lib/modules/3.13.0-37-generic/kernel/drivers/net/wireless/iwlwifi/dvm/iwldvm.ko
license:        GPL
author:         Copyright(c) 2003-2013 Intel Corporation <ilw@linux.intel.com>
version:        in-tree:
description:    Intel(R) Wireless WiFi Link AGN driver for Linux
srcversion:     CC4D1BA11C1EF73A6ABDE53
depends:        iwlwifi,mac80211,cfg80211
intree:         Y
vermagic:       3.13.0-37-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        2C:B1:13:3B:35:F9:5A:9E:24:DE:AB:EE:B1:2B:A4:49:BC:BA:BB:C9
sig_hashalgo:   sha512

[mac80211]
filename:       /lib/modules/3.13.0-37-generic/kernel/net/mac80211/mac80211.ko
license:        GPL
description:    IEEE 802.11 subsystem
srcversion:     B822641624778B987844F6F
depends:        cfg80211
intree:         Y
vermagic:       3.13.0-37-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        2C:B1:13:3B:35:F9:5A:9E:24:DE:AB:EE:B1:2B:A4:49:BC:BA:BB:C9
sig_hashalgo:   sha512
parm:           max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm:           max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm:           beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm:           probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm:           ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)

[iwlwifi]
filename:       /lib/modules/3.13.0-37-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
license:        GPL
author:         Copyright(c) 2003-2013 Intel Corporation <ilw@linux.intel.com>
version:        in-tree:
description:    Intel(R) Wireless WiFi driver for Linux
firmware:       iwlwifi-100-5.ucode
firmware:       iwlwifi-1000-5.ucode
firmware:       iwlwifi-135-6.ucode
firmware:       iwlwifi-105-6.ucode
firmware:       iwlwifi-2030-6.ucode
firmware:       iwlwifi-2000-6.ucode
firmware:       iwlwifi-5150-2.ucode
firmware:       iwlwifi-5000-5.ucode
firmware:       iwlwifi-6000g2b-6.ucode
firmware:       iwlwifi-6000g2a-5.ucode
firmware:       iwlwifi-6050-5.ucode
firmware:       iwlwifi-6000-4.ucode
firmware:       iwlwifi-7265-7.ucode
firmware:       iwlwifi-3160-7.ucode
firmware:       iwlwifi-7260-7.ucode
srcversion:     C2D0F3DFCA289585C100E36
depends:        cfg80211
intree:         Y
vermagic:       3.13.0-37-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        2C:B1:13:3B:35:F9:5A:9E:24:DE:AB:EE:B1:2B:A4:49:BC:BA:BB:C9
sig_hashalgo:   sha512
parm:           swcrypto:using crypto in software (default 0 [hardware]) (int)
parm:           11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm:           amsdu_size_8K:enable 8K amsdu size (default 0) (int)
parm:           fw_restart:restart firmware in case of error (default true) (bool)
parm:           antenna_coupling:specify antenna coupling in dB (defualt: 0 dB) (int)
parm:           wd_disable:Disable stuck queue watchdog timer 0=system default, 1=disable, 2=enable (default: 0) (int)
parm:           nvm_file:NVM file name (charp)
parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm:           led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm:           power_save:enable WiFi power management (default: disable) (bool)
parm:           power_level:default power save level (range from 1 - 5, default: 1) (int)

[cfg80211]
filename:       /lib/modules/3.13.0-37-generic/kernel/net/wireless/cfg80211.ko
description:    wireless configuration support
license:        GPL
author:         Johannes Berg
srcversion:     C2478077E22138832B71659
depends:        
intree:         Y
vermagic:       3.13.0-37-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        2C:B1:13:3B:35:F9:5A:9E:24:DE:AB:EE:B1:2B:A4:49:BC:BA:BB:C9
sig_hashalgo:   sha512
parm:           ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm:           cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)

##### module parameters #################

[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
probe_wait_ms: 500

[iwlwifi]
11n_disable: 0
amsdu_size_8K: 0
antenna_coupling: 0
bt_coex_active: Y
fw_restart: Y
led_mode: 0
nvm_file: (null)
power_level: 0
power_save: N
swcrypto: 0
wd_disable: 1

[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00

##### /etc/modules ######################

lp
rtc

##### modprobe options ##################

[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci

[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac

[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off

[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211

[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en

##### rc.local ##########################

exit 0

##### pm-utils ##########################

##### udev rules ########################

[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x10ec:0x8136 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'eth0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x8086:0x0083 (iwlwifi)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC 'wlan0' [IF]>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

##### dmesg #############################

[   11.871302] iwlwifi 0000:12:00.0: irq 48 for MSI/MSI-X
[   12.305479] iwlwifi 0000:12:00.0: loaded firmware version 39.31.5.1 build 35138 op_mode iwldvm
[   12.603098] iwlwifi 0000:12:00.0: CONFIG_IWLWIFI_DEBUG disabled
[   12.603102] iwlwifi 0000:12:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
[   12.603104] iwlwifi 0000:12:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[   12.603107] iwlwifi 0000:12:00.0: Detected Intel(R) Centrino(R) Wireless-N 1000 BGN, REV=0x6C
[   12.603165] iwlwifi 0000:12:00.0: L1 Disabled; Enabling L0S
[   12.722248] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
[   19.813606] iwlwifi 0000:12:00.0: L1 Disabled; Enabling L0S
[   19.820986] iwlwifi 0000:12:00.0: Radio type=0x0-0x0-0x3
[   19.856115] iwlwifi 0000:12:00.0: L1 Disabled; Enabling L0S
[   19.863500] iwlwifi 0000:12:00.0: Radio type=0x0-0x0-0x3
[   19.912166] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready (repeated 2 times)

########## wireless info END ############

[AlbertP]

I see five wireless networks in the iwlist scan output, is your wireless one of them:
- hemelatha
- Jertel
- belkin.3b6c
- Ananya
- MGMNT

[DrHu]

http://ubuntuforums.org/showthread.php?t=1585064
--rfkill switch

• Second, the module dell-laptop sometimes does not correctly translate key presses to useful activity. Let's unload it and see if we can get the wireless to come to life. Please do:
  sudo rmmod -f dell-laptop
  sudo rfkill unblock all
  iwconfig
  Is your wireless working now? If so, we can permanently block the module with:
  
  sudo su
  echo "blacklist dell-laptop" >> /etc/modprobe.d/blacklist.conf
  exit
  --some info there and also how to check devices network status..

I'd probably start with that method unload the module and restart, and I would check if you may need to blacklist the module itself, search for that device issues with Mint or Ubuntu or Linux (general) could be of help..

---------------------------------------------------------------------------------------------------------------------------------------------------
Sorry, I guess i had better read those logs more carefully, I see rfkill in use (although not often needed )in your log
---------------------------------------------------------------------------------------------------------------------------------------------------

your log info..

• Device: wlan0 ----------------------------------------------------------------
  Type: 802.11 WiFi
  Driver: iwlwifi
  State: disconnected
  Default: no
  HW Address: <MAC 'wlan0'

--also your rout table looks odd..

I would probably start looking at my wifi and IP addressing functions to see that I had the correct configuration setup for particular devices (wlan0) and that the network controls were selected correctly
--and I am not sure (but don't have much time to check) if you need the broadcom driver STA for that particular wifi device..

WIFI setups..
http://www.linux.com/learn/tutorials/37 ... hese-tools
http://www.linuxhomenetworking.com/wiki ... QRac47F-MU

[Pjotr]

Apart from what has already been said: set the security of your router to WPA2 with "AES only". That helps sometimes. And make sure the SSID is being broadcast (don't hide it; hiding is even harmful).

Some more tips about configuring your wireless network correctly:
https://sites.google.com/site/easylinux ... tywireless

Also worthwhile doing: make sure that your router is transmitting on a channel that's relatively unused in your surroundings. Select only channel 1, 6 or 11, because only those have no overlap.

[blizzard]

@albertP: Nope, my SSID is different.

@DrHu: I tried the 3(rmmod,rfkill,iwconfig) commands, but no use, my wifi network still not visible.

@pjotr: Exisiting wifi configration is "WPA2" and "AES" only.
As in the link, I was not hiding my SSID, I have latest firmware installed and I have tried all channels from 1-13, but nothing works

@all: http://wisp.pl/al/demo/RT-N10E/wlbasic.htm checkout various configuration details about the router.

[JeremyB]

@albertP: Nope, my SSID is different.

@DrHu: I tried the 3(rmmod,rfkill,iwconfig) commands, but no use, my wifi network still not visible.

@pjotr: Exisiting wifi configration is "WPA2" and "AES" only.
As in the link, I was not hiding my SSID, I have latest firmware installed and I have tried all channels from 1-13, but nothing works :(

@all: http://wisp.pl/al/demo/RT-N10E/wlbasic.htm checkout various configuration details about the router.

This could be a regulatory issue so let's set the country code, if you are in India the command is

Code: Select all

sudo iw reg set IN

and then

Code: Select all

sudo gedit /etc/default/crda

and change the final line to [/code]REGDOMAIN=IN[/code] Save, exit program, and reboot. You might have issues with your wifi card if your wifi router is 11n only, but we can do this

Code: Select all

echo "options iwlwifi 11n_disable=8" | sudo tee /etc/modprobe.d/iwl2.conf

This command does not disable wireless N, it actually improves the performance of the card on wireless N networks

[blizzard]

@JeremyB : I set the region code and disabled 11n functionality also, but still it's not working. This is my iwlwifi.conf file contents:

Code: Select all

/etc/modprobe.d $ cat iwlwifi.conf 
# /etc/modprobe.d/iwlwifi.conf
# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
# microcode file installed on the system.  When removing iwlwifi, first
# remove the iwl?vm module and then iwlwifi.
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
options iwlwifi 11n_disable=8

[Pjotr]

It might be something simple: maybe your network is hiding under "More..." in the network list?

[blizzard]

@Pjotr: Nope, I'm also checking via terminal too.

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sudo iwlist wlan0 scan | grep -i essid

My SSID is not displayed.

[JeremyB]

I am not sure if this will help or not, but it is worth a shot. Using the latest backports, enter one line at a time in terminal

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sudo apt-get install linux-headers-generic build-essential
wget https://www.kernel.org/pub/linux/kernel/projects/backports/stable/v3.19-rc1/backports-3.19-rc1-1.tar.gz
tar -zxvf backports-3.19-rc1-1.tar.gz
cd backports-3.19-rc1-1
make defconfig-iwlwifi
make
sudo make install

reboot and see if it helps
If it doesn't help, it can be removed with

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cd backports-3.19-rc1-1
sudo make uninstall

[Pjotr]

Or upgrade the firmware of your router to the latest version. It's beginning to look like a router problem, not a Mint problem....

[blizzard]

@JeremyB: Tried it, not working.

@Pjotr: I don't think it's a router problem, since I was able to access the same wifi network in my Windows-7 and my mobile too.

Okay, guys thanks for the help, I'll use ethernet cable for connecting to router, If I find any possible solution, I 'll update.

[sebastianhatt]

Did you find a solution? I'm experiencing a similar problem, network showing up on my phone, but not on the computer. But for me it's only periodical. Most days I have no problems with my wireless network.

Which router do you have? Mine is a Zyxel VMG8924-B10A.

[JeremyB]

Did you find a solution? I'm experiencing a similar problem, network showing up on my phone, but not on the computer. But for me it's only periodical. Most days I have no problems with my wireless network.

Which router do you have? Mine is a Zyxel VMG8924-B10A.

Does

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iw reg get; cat /etc/default/crda | grep REGDOMAIN

show the correct country code. Do you know what channel the wifi is on when the linux computer can't find it?

[Ranthe]

My wife is experiencing a similar problem with Mint 17.3 Rosa on her Dell Inspiron 5520 - after many months of rock-solid connections, from yesterday the laptop Wifi can detect every wifi router in the neighbourhood except the one in the house - a D-LINK DIR-600 - less than a metre from the machine. But the same router is visible to my Android phone, and Ethernet connection to her machine and mine from the same router still works.

I've tried resetting the router (including a factory reset and reconfigure) and confirmed the router has the latest firmware. I've confirmed through Device Manager that the Broadcomm wifi drivers for the Dell are the latest versions, and have set the REGDOMAIN to "NZ" as per JeremyB below. Still no joy.
The last resort is either updating the kernel from 3.13 to 3.19 through Update Manager (the machine started with 17.1 and has been upgraded through the Update Manager), or doing a full re-install from USB. Not sure if that'll solve the problem - is this a potential option?

The only thing that's been different over the last couple of days is updating the dual-boot of Windows 7 to Windows 10, but I struggle to think how a Windows upgrade can nobble the wifi on a Linus OS when Windows doesn't even know the Linux partitions(s) exist. Unless Win10 has managed to do a wifi firmware update?
(My only "consolation" is that Win10's wifi connectivity on the Dell is so unreliable we're already considering reverting to Win7 on the dual-boot!)

[Pjotr]

On what channel is your router broadcasting?

[Ranthe]

Channel 12.

[Pjotr]

Try if it helps when you change the channel to 1, 6 or 11. Reason: in some countries, among which the USA, channels above 11 are forbidden. This might lead driver developers to disregard the potential presence of those higher channels.

Out of those three, select the channel that's optimal for you, i.e. the one that's least in use by other routers in your vicinity. You can use the free Android app Wifi Analyzer for that (if you have an Android smartphone).

[Ranthe]

Try if it helps when you change the channel to 1, 6 or 11. Reason: in some countries, among which the USA, channels above 11 are forbidden. This might lead driver developers to disregard the potential presence of those higher channels.

Out of those three, select the channel that's optimal for you, i.e. the one that's least in use by other routers in your vicinity. You can use the free Android app Wifi Analyzer for that (if you have an Android smartphone).

I changes the channel selection on the router from "Auto" to "Channel 11", and I also updated the routher WPA2 encryption from "TKIP/AES" to "AES" only as per your wireless security tips.

Wireless connectivity from our router to my wife's laptop is now restored, and she's happy!
Still don't understand why if failed in the first place after it working for well over twelve months, but it's working now so all is good. Thanks for the assistance!

[Tartanspartan01]

thanks guys, changing channel worked for me , whats really weird is id just tried pretty much every flavor of mint yesterday and didnt encounter this problem at all , it might explain some other oddities in my testing yesterday on an older computer and with windows also, for reference i was on channel 13 before, worked immediately when changed to 11, was showing everyone elses wifi and other devices picked up my router no probs.
good luck to anyone else googling this ☺