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Old 11-17-2017, 01:58 AM   #1
brijeshganapathy
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Exclamation CentOS 7 not detecting WiFi Networks


Hello All

I have recently installed CentOS 7 on my old Dell Inspiron 1545 Laptop

Everything works fine except for Wifi.

With great difficult i was able to install the drivers following the instructions on the ELREPO website located at http://elrepo.org/tiki/wl-kmod

I was successful in completing the task.

I am able to see the Wifi tab in network setting of Gnome, which was not earlier visible.


However, the Wifi Networks are not getting listed under wireless networks

Attaching Images....








For your reference, these are few information about the system

Kernel Details

3.10.0-693.el7.x86_64 x86_64

OS Details

Description: CentOS Linux release 7.4.1708 (Core)
Release: 7.4.1708
Codename: Core

I am kind of a noob to all this.

I am at my wits end trying to resolve this.

Any input will be greatly helpful
 
Old 11-17-2017, 02:57 PM   #2
jsbjsb001
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Location: Earth? I would say I hope so but I'm not so sure about that... I could just be a figment of your imagination too.
Distribution: CentOS at the time of this writing, but some others over the years too...
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I can't say for sure this is your issue but, this thread may help: https://www.linuxquestions.org/quest...-a-4175611433/

Hope this helps.
 
Old 11-20-2017, 04:15 PM   #3
Dr_KO
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Re:CentOS 7 not detecting WiFi Networks

I am having this exact same issue.
Not blocked in rfkill
Can't bring up the interface.

lshw -c network
*-network DISABLED
description: Wireless interface
product: Wireless 8260
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wls1
version: 3a
serial: 8a:32:d5:20:7f:e0
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.10.0-693.5.2.el7.x86_64 firmware=27.455470.0 latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:59 memory:f3200000-f3201ff
 
Old 11-20-2017, 06:52 PM   #4
ferrari
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Check device state as reported by
Code:
ip link
What happens if you try to bring the interface up manually?
Code:
ip link set dev wls1 up
If using NetworkManager, what is reported by nmcli?
Code:
nmcli d
Code:
nmcli g
 
Old 11-21-2017, 12:33 PM   #5
Dr_KO
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Here is the output from those commands:

Quote:
Originally Posted by ferrari View Post
Check device state as reported by
Code:
ip link
ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
link/ether 48:0f:cf:66:e7:d5 brd ff:ff:ff:ff:ff:ff
3: enp5s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
link/ether 48:0f:cf:66:e7:d6 brd ff:ff:ff:ff:ff:ff
4: wls1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 1000
link/ether 2a:85:67:c4:45:62 brd ff:ff:ff:ff:ff:ff
5: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT qlen 1000
link/ether 52:54:00:56:ee:8e brd ff:ff:ff:ff:ff:ff
6: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN mode DEFAULT qlen 1000
link/ether 52:54:00:56:ee:8e brd ff:ff:ff:ff:ff:ff

What happens if you try to bring the interface up manually?
Code:
ip link set dev wls1 up
sudo ip link set dev wls1 up
RTNETLINK answers: Input/output error

If using NetworkManager, what is reported by nmcli?
Code:
nmcli d
nmcli d
DEVICE TYPE STATE CONNECTION
virbr0 bridge connected virbr0
eno1 ethernet connected Auto eth NAS
enp5s0 ethernet unavailable --
wls1 wifi unavailable --
lo loopback unmanaged --
virbr0-nic tun unmanaged --
Code:
nmcli g
nmcli g
STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN
connected (local only) unknown enabled enabled enabled enabled
 
Old 11-21-2017, 03:05 PM   #6
ferrari
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Code:
sudo ip link set dev wls1 up
RTNETLINK answers: Input/output error
This is a a problem obviously.

Capture and post the output from the following...
Code:
dmesg|egrep -i "iwlwifi|firmware"
 
Old 11-21-2017, 03:12 PM   #7
ferrari
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BTW, please confirm the distro/version are you using here.
 
Old 11-21-2017, 03:35 PM   #8
Dr_KO
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Quote:
Originally Posted by ferrari View Post
Code:
sudo ip link set dev wls1 up
RTNETLINK answers: Input/output error
This is a a problem obviously.

Capture and post the output from the following...
Code:
dmesg|egrep -i "iwlwifi|firmware"
Here you go, I attached it as text as it is rather long.

Also,
CentOS Linux release 7.4.1708 (Core)
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

CentOS Linux release 7.4.1708 (Core)
CentOS Linux release 7.4.1708 (Core)
Attached Files
File Type: txt dmesg.out.txt (67.7 KB, 20 views)
 
Old 11-21-2017, 06:49 PM   #9
ferrari
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As suspected, there are a number of troubling errors reported...
Code:
iwlwifi 0000:02:00.0: Microcode SW error detected.  Restarting 0x82000000.
Code:
iwlwifi 0000:02:00.0: Start IWL Error Log Dump:
iwlwifi 0000:02:00.0: Status: 0x00000000, count: 6
Code:
iwlwifi 0000:02:00.0: failed to send the paging cmd
iwlwifi 0000:02:00.0: Failed to start RT ucode: -5
A possible firmware issue perhaps? This might be best progressed with a CentOS bug report. I can't really assist further here unfortunately.
 
Old 11-24-2017, 05:04 PM   #10
Dr_KO
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Thank you for your help!
 
  


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