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    [SOLVED] 5Ghz WiFi, not detected

    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!
    Last edited by alquimista.ndc; Jan 20, 2023, 05:31 PM.

    #2
    Did the desktop PC previously see/use a 5Ghz network?
    Using Kubuntu Linux since March 23, 2007
    "It is a capital mistake to theorize before one has data." - Sherlock Holmes

    Comment


      #3
      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.
      Click image for larger version

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      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

      Comment


        #4
        Originally posted by claydoh View Post
        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.
        Click image for larger version  Name:	Screenshot_20230120_180002.png Views:	0 Size:	309.0 KB ID:	667904 Click image for larger version  Name:	Screenshot_20230120_180113.png Views:	0 Size:	140.7 KB ID:	667903
        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:

        Code:
        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?
        Last edited by alquimista.ndc; Jan 20, 2023, 05:32 PM.

        Comment


          #5
          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:
          Code:
          $ 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)
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			
          			.
          Code:
          $ 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
          Last edited by claydoh; Jan 21, 2023, 04:34 PM. Reason: I liked it my way :p

          Comment


            #6
            Originally posted by claydoh View Post
            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

            Code:
            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!
            Last edited by Snowhog; Jan 21, 2023, 01:27 PM.

            Comment

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