[Solved] No Wi-Fi adapter found on CentOS 7.9

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shawkot

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I installed CentOS 7.9 on my machine yesterday. I installed "Server with GUI". Before installing "Server with GUI", I installed 'Minimal installation'. But in either case I can't connect to the internet via wirelessly. I tried a lot of solution, but nothing works!!
When I run ip a, it shows my wifi adapter. But not connected. Wi-Fi option is hashed on my menu bar.
When I run nmcli conn, it only shows ehternet device.
When I run nmcli d, it listed my wi-fi adapters as "unavailable".
How can I solve this problem?
Any help will be highly appreciated!
Thank you.
 


Brickwizard

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shawkot said:
but nothing works!!
Click to expand...
could be more than one solution, is it an internal or external [usb] adapter
do you know which make/model the adapter is [some are not supported out of the box]
Did it work on any other previous Linux installation?
can you submit the full make and model of the box your running? [there may be a known problem with the hardware]
Bwiz
 
f33dm3bits

f33dm3bits

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Share the output of the following.
Code: 
nmcli dev show
nmcli con show
ip a
 
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shawkot

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brickwizard said:
could be more than one solution, is it an internal or external [usb] adapter
do you know which make/model the adapter is [some are not supported out of the box]
Did it work on any other previous Linux installation?
can you submit the full make and model of the box your running? [there may be a known problem with the hardware]
Bwiz
Click to expand...
It worked fine with Ubuntu 20.04 LTS
 
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shawkot

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f33dm3bits said:
Share the output of the following.
Code: 
nmcli dev show
nmcli con show
ip a
Click to expand...
nmcli dev show
GENERAL.DEVICE: enp0s20u2
GENERAL.TYPE: ethernet
GENERAL.HWADDR: 02:51:40:29:4C:CA
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: Wired connection 1
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/4
WIRED-PROPERTIES.CARRIER: on
IP4.ADDRESS[1]: 192.168.42.241/24
IP4.GATEWAY: 192.168.42.129
IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 192.168.42.129, mt = 100
IP4.ROUTE[2]: dst = 192.168.42.0/24, nh = 0.0.0.0, mt = 100
IP4.DNS[1]: 192.168.42.129
IP6.ADDRESS[1]: fe80::7836:8462:403e:1bd6/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = fe80::/64, nh = ::, mt = 100
IP6.ROUTE[2]: dst = ff00::/8, nh = ::, mt = 256, table=255

GENERAL.DEVICE: virbr0
GENERAL.TYPE: bridge
GENERAL.HWADDR: 52:54:00:A4:B7:63
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: virbr0
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/1
IP4.ADDRESS[1]: 192.168.122.1/24
IP4.GATEWAY: --
IP4.ROUTE[1]: dst = 192.168.122.0/24, nh = 0.0.0.0, mt = 0
IP6.GATEWAY: --

GENERAL.DEVICE: virbr0-nic
GENERAL.TYPE: tun
GENERAL.HWADDR: 52:54:00:A4:B7:63
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: virbr0-nic
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/2

GENERAL.DEVICE: p4p2
GENERAL.TYPE: ethernet
GENERAL.HWADDR: 14:18:77:D4:58:39
GENERAL.MTU: 1500
GENERAL.STATE: 20 (unavailable)
GENERAL.CONNECTION: --
GENERAL.CON-PATH: --
WIRED-PROPERTIES.CARRIER: off

GENERAL.DEVICE: wlp0s20u1
GENERAL.TYPE: wifi
GENERAL.HWADDR: AA:AC:A8:86:E6:17
GENERAL.MTU: 1500
GENERAL.STATE: 20 (unavailable)
GENERAL.CONNECTION: --
GENERAL.CON-PATH: --

GENERAL.DEVICE: wlp6s0
GENERAL.TYPE: wifi
GENERAL.HWADDR: 8A:38:2E:5F:13:D8
GENERAL.MTU: 1500
GENERAL.STATE: 20 (unavailable)
GENERAL.CONNECTION: --
GENERAL.CON-PATH: --

GENERAL.DEVICE: lo
GENERAL.TYPE: loopback
GENERAL.HWADDR: 00:00:00:00:00:00
GENERAL.MTU: 65536
GENERAL.STATE: 10 (unmanaged)
GENERAL.CONNECTION: --
GENERAL.CON-PATH: --
IP4.ADDRESS[1]: 127.0.0.1/8
IP4.GATEWAY: --
IP6.ADDRESS[1]: ::1/128
IP6.GATEWAY:

nmcli con show
NAME UUID TYPE DEVICE
Wired connection 1 5b1c1ea8-2d1e-3756-964c-4a2e7f3960a2 ethernet enp0s20u2
virbr0 2246d95f-1c14-4850-a677-6b3d85384664 bridge virbr0
virbr0-nic 343a9e48-af18-46b7-8cdb-52f0b3b7ffdd tun virbr0-nic
p4p2 54f6dba7-e36f-44a7-bb7c-63de7e5effc1 ethernet --

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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: p4p2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 14:18:77:d4:58:39 brd ff:ff:ff:ff:ff:ff
3: wlp0s20u1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether aa:ac:a8:86:e6:17 brd ff:ff:ff:ff:ff:ff
4: wlp6s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 8a:38:2e:5f:13:d8 brd ff:ff:ff:ff:ff:ff
5: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
link/ether 52:54:00:a4:b7:63 brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
6: virbr0-nic: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
link/ether 52:54:00:a4:b7:63 brd ff:ff:ff:ff:ff:ff
8: enp0s20u2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
link/ether 02:51:40:29:4c:ca brd ff:ff:ff:ff:ff:ff
inet 192.168.42.241/24 brd 192.168.42.255 scope global noprefixroute dynamic enp0s20u2
valid_lft 2883sec preferred_lft 2883sec
inet6 fe80::7836:8462:403e:1bd6/64 scope link noprefixroute
valid_lft forever preferred_lft forever
 
f33dm3bits

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Can you please put CODE tags around the output to prevent certain letter and punctuation combinations to turn into smilies. Do you have NetworkManager-wifi installed, if not install it and then restart NetworkManager and then share the output of these again.
Code: 
nmcli con show
nmcli dev show
 
Last edited:
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shawkot

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f33dm3bits said:
Can you please put CODE tags around the output to prevent certain letter and punctuation combinations to turn into smilies. Do you have NetworkManager-wifi installed, if not install it and then restart NetworkManager and then share the output of these again.
Code: 
nmcli con show
nmcli dev show
Click to expand...
Yes, I have NetworkManager-wifi installed
Code: 
nmcli con show
NAME                UUID                                  TYPE      DEVICE     
Wired connection 1  5b1c1ea8-2d1e-3756-964c-4a2e7f3960a2  ethernet  enp0s20u2  
virbr0              2246d95f-1c14-4850-a677-6b3d85384664  bridge    virbr0     
virbr0-nic          343a9e48-af18-46b7-8cdb-52f0b3b7ffdd  tun       virbr0-nic 
p4p2                54f6dba7-e36f-44a7-bb7c-63de7e5effc1  ethernet  --         

nmcli dev show
GENERAL.DEVICE:                         enp0s20u2
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         02:51:40:29:4C:CA
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     Wired connection 1
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/4
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.42.241/24
IP4.GATEWAY:                            192.168.42.129
IP4.ROUTE[1]:                           dst = 0.0.0.0/0, nh = 192.168.42.129, mt = 100
IP4.ROUTE[2]:                           dst = 192.168.42.0/24, nh = 0.0.0.0, mt = 100
IP4.DNS[1]:                             192.168.42.129
IP6.ADDRESS[1]:                         fe80::7836:8462:403e:1bd6/64
IP6.GATEWAY:                            --
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 100
IP6.ROUTE[2]:                           dst = ff00::/8, nh = ::, mt = 256, table=255

GENERAL.DEVICE:                         virbr0
GENERAL.TYPE:                           bridge
GENERAL.HWADDR:                         52:54:00:A4:B7:63
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     virbr0
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
IP4.ADDRESS[1]:                         192.168.122.1/24
IP4.GATEWAY:                            --
IP4.ROUTE[1]:                           dst = 192.168.122.0/24, nh = 0.0.0.0, mt = 0
IP6.GATEWAY:                            --

GENERAL.DEVICE:                         virbr0-nic
GENERAL.TYPE:                           tun
GENERAL.HWADDR:                         52:54:00:A4:B7:63
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     virbr0-nic
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/2

GENERAL.DEVICE:                         p4p2
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         14:18:77:D4:58:39
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
WIRED-PROPERTIES.CARRIER:               off

GENERAL.DEVICE:                         wlp0s20u1
GENERAL.TYPE:                           wifi
GENERAL.HWADDR:                         AA:AC:A8:86:E6:17
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --

GENERAL.DEVICE:                         wlp6s0
GENERAL.TYPE:                           wifi
GENERAL.HWADDR:                         8A:38:2E:5F:13:D8
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --

GENERAL.DEVICE:                         lo
GENERAL.TYPE:                           loopback
GENERAL.HWADDR:                         00:00:00:00:00:00
GENERAL.MTU:                            65536
GENERAL.STATE:                          10 (unmanaged)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
IP4.ADDRESS[1]:                         127.0.0.1/8
IP4.GATEWAY:                            --
IP6.ADDRESS[1]:                         ::1/128
IP6.GATEWAY:                            --
 
f33dm3bits

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It sounds more like you have your is Wifi disabled, either with a key combination or through the NetworkManager applet you can enable/disable wireless devices.
 
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shawkot

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f33dm3bits said:
It sounds more like you have your is Wifi disabled, either with a key combination or through the NetworkManager applet you can enable/disable wireless devices.
Click to expand...
How can I enable wireless devices?
 
f33dm3bits

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To show you, here's my wireless device when I have wifi disabled.
Code: 
GENERAL.DEVICE:                         wlan0
GENERAL.TYPE:                           wifi
GENERAL.HWADDR:                         66:16:40:AD:0A:00
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
Here's the same device when I have it enabled.
Code: 
GENERAL.DEVICE:                         wlan0
GENERAL.TYPE:                           wifi
GENERAL.HWADDR:                         FA:2D:67:68:B6:BD
GENERAL.MTU:                            1500
GENERAL.STATE:                          30 (disconnected)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
[/COD]
 
f33dm3bits

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shawkot said:
How can I enable wireless devices?
Click to expand...
f33dm3bits said:
With a key combination or through the NetworkManager applet you can enable/disable wireless devices.
Click to expand...
Right click on the NetworkManager applet in your notification area and then check "Enable Wi-Fi" or a key combination if it's a laptop which would be a combination of FN+(One of the f1-f12) keys.
 
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shawkot

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f33dm3bits said:
It sounds more like you have your is Wifi disabled, either with a key combination or through the NetworkManager applet you can enable/disable wireless devices.
Click to expand...
I can't see any option like "Enable Wi-Fi" in my notification area. In my notification area, NetworkManager applet shows wifi adapter, but they are hashed!!
By the way, I tried to enable wifi by, nmcli radio wifi on. But it's not working!
1621692068826.png
 
f33dm3bits

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Click on "PCI Wi-Fi Off" and I suspect there should be an option to turn it on. I'm assuming your wireless network interface is internal so pci and not usb?
 
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f33dm3bits said:
Click on "PCI Wi-Fi Off" and I suspect there should be an option to turn it on. I'm assuming your wireless network interface is internal so pci and not usb?
Click to expand...
I click there to turn it on. But nothing happened. It didn't turn on.
Yes, I have an internal wifi adapter.
 
f33dm3bits

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Is it a laptop?
 
f33dm3bits

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Then it's probably either a physical switch on the laptop or a key combination to turn it on. What's the exact brand and model of your laptop?
 
f33dm3bits

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Try pressing the FN key + F2(the key that has a wireless icon on it), it maybe that on your laptop the it's located on a different F key.
q90vy.jpg


On some laptops there may also be a physical switch to turn the wireless device on/off that may look like this.
Q360I.png
 
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shawkot

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f33dm3bits said:
Try pressing the FN key + F2(the key that has a wireless icon on it), it maybe that on your laptop the it's located on a different F key.
q90vy.jpg


On some laptops there may also be a physical switch to turn the wireless device on/off that may look like this.
Q360I.png
Click to expand...
It works!!
Thank you very much!! You are so helpful! Really appreciate your time and effort!!
Thanks again!!
 
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