[SOLVED] 5Ghz WiFi, not detected

[alquimista.ndc]

Hi,

My ISP has changed the modem, and the new one now has 2 netrworks, one for 2.4, one for 5 Ghz

In an HP laptop where I have Kubuntu 22.04, its is well detected and works fine. In a desktop PC with the same Kubuntu version, the 5Ghz network is not detected; only catches de 2.4 Ghz. Any config that I shlould do in the desktop?

Regards!

[Snowhog]

Did the desktop PC previously see/use a 5Ghz network?

[claydoh]

A good guess is that the desktop PC's wifi card doesn't support 5Ghz
if you don't know what type of card/chip it has, you can find some info using the Info Center tool.

Look for it under PCI devices, similar to the first image. You can use filters and use 'net' or similar strings to help wade through.
If you have a USB dongle instead of in internal card, use the USB section, as seen on the right. In both cases you can copy the actual text into a reply.

Alternatively, you can try the command line.
lshw -C network for the internal cards -- it will show both WiFi and wired.
and for usb: lsusb

[alquimista.ndc]

A good guess is that the desktop PC's wifi card doesn't support 5Ghz
if you don't know what type of card/chip it has, you can find some info using the Info Center tool.

Look for it under PCI devices, similar to the first image. You can use filters and use 'net' or similar strings to help wade through.
If you have a USB dongle instead of in internal card, use the USB section, as seen on the right. In both cases you can copy the actual text into a reply.

Alternatively, you can try the command lshw -C network
lshw -C network for the internal cards -- it will show both WiFi and wired.
and for usb: lsusb

Hi,

Its the first time I try with this card, to get a 5 Ghz network; indeed is an old card. I executed the command lshw -C network. The output I get is:

memo@nemo-kde:~$ lshw -C network
WARNING: you should run this program as super-user.
 *-network                  
      description: Wireless interface
      product: AR9227 Wireless Network Adapter
      vendor: Qualcomm Atheros
      physical id: 1
      bus info: pci@0000:04:01.0
      logical name: wlp4s1
      version: 01
      serial: 84:16:f9:3a:50:e7
      width: 32 bits
      clock: 66MHz
      capabilities: bus_master cap_list ethernet physical wireless
      configuration: broadcast=yes driver=ath9k driverversion=5.15.0-58-generic firmware=N/A ip=192.168.1.78 latency=168 link=yes multicast=yes wireless=IEEE 802.11
      resources: irq:19 memory:df100000-df10ffff

​

Is there a parameter there, that indicates taking only 2.4 Ghz?

[claydoh]

As far as I can see, this chip does not seem to support the modern WiFi protocols, but we can check, using iwlist


Using the name info from the lshw command, we can run it like so to see what frequencies are supported:
$ iwlist wlp4s1 frequency

If you only see 2.4gh ranges, that is all the device supports.

Here is my 10 year old laptop, which I know does not support 5Ghz

Here is my PC which has a modern card:

$ iwlist wlo1 frequency wlo1 11 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 Current Frequency:2.427 GHz (Channel 4) .

$ iwlist wlp4s0 frequency wlp4s0 32 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 Channel 36 : 5.18 GHz Channel 40 : 5.2 GHz Channel 44 : 5.22 GHz Channel 48 : 5.24 GHz Channel 52 : 5.26 GHz Channel 56 : 5.28 GHz Channel 60 : 5.3 GHz Channel 64 : 5.32 GHz Channel 100 : 5.5 GHz Channel 104 : 5.52 GHz Channel 108 : 5.54 GHz Channel 112 : 5.56 GHz Channel 116 : 5.58 GHz Channel 120 : 5.6 GHz Channel 124 : 5.62 GHz Channel 128 : 5.64 GHz Channel 132 : 5.66 GHz Channel 136 : 5.68 GHz Channel 140 : 5.7 GHz

[alquimista.ndc]

As far as I can see, this chip does not seem to support the modern WiFi protocols, but we can check, using iwlist


Using the name info from the lshw command, we can run it like so to see what frequencies are supported:
$ iwlist wlp4s1 frequency

If you only see 2.4gh ranges, that is all the device supports.

Indeed, seems my card does not support 5 Ghz

memo@nemo-kde:~$ iwlist wlp4s1 frequency
wlp4s1 11 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
Current Frequency:2.437 GHz (Channel 6)

​

Thank you for your help!