bcm43142 doesn't support 5ghz freq

jesuismasoud · 2018-08-27 08:35:00

Hey, I want to connect to a 5GHZ wifi connection but didn't show up in available connections but i see 5ghz channel according to the output of "iwlist wlp3s0 channel":

wlp3s0    29 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 38 : 5.19 GHz
          Channel 40 : 5.2 GHz
          Channel 42 : 5.21 GHz
          Channel 44 : 5.22 GHz
          Channel 46 : 5.23 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 149 : 5.745 GHz
          Channel 153 : 5.765 GHz
          Channel 157 : 5.785 GHz
          Channel 161 : 5.805 GHz
          Channel 165 : 5.825 GHz
          Current Frequency:2.462 GHz (Channel 11)

I've also tried to set 5ghz channel but didn't work. what's wrong? and how can i fix this?

Last edited by jesuismasoud (2018-08-27 08:36:01)

ewaller · 2018-08-27 15:03:50

Have you set your regulatory domain for your wifi? It may be that the AP is on a frequency that is not supported in the default domain.
Also, does the 5GHz work on elsewhere? Could the antenna control setting for the kernel module be incorrect?

jesuismasoud · 2018-08-28 09:05:20

On the other systems the 5GHz connections are visible and i'm able to connect to them,

Last edited by jesuismasoud (2018-08-28 09:17:53)

ewaller · 2018-08-28 14:26:21

Not quite what I had asked. Does *this* computer have the ability to connect to *other* 5GHz APs. Not all countries have the same channels available. If your router is using a channel that is not in the regulatory setting of your Arch system, it might not see it:

ewaller@turing/home/ewaller % iw  reg get
global
country 00: DFS-UNSET
        (2402 - 2472 @ 40), (N/A, 20), (N/A)
        (2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
        (2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
        (5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
        (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
        (5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
        (5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
        (57240 - 63720 @ 2160), (N/A, 0), (N/A)

ewaller@turing/home/ewaller % sudo iw reg set US
[sudo] password for ewaller:
ewaller@turing/home/ewaller % iw  reg get
global
country US: DFS-FCC
        (2402 - 2472 @ 40), (N/A, 30), (N/A)
        (5170 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
        (5250 - 5330 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
        (5490 - 5730 @ 160), (N/A, 23), (0 ms), DFS
        (5735 - 5835 @ 80), (N/A, 30), (N/A)
        (57240 - 63720 @ 2160), (N/A, 40), (N/A)

ewaller@turing/home/ewaller %

If it does not work on other APs, and if the channels are available on both the AP and the host, then the problem might be with the antenna select. Your radio is a MIMO radio. https://en.wikipedia.org/wiki/MIMO
The chipset supports multiple antennae. BUT, not all laptops have the full compliment of antennae that the chipset supports and *may* have unused antenna ports. It has been known to happen that the default setting for the driver selects a port with no antenna. This is a little hard on signal level

My two guesses are: (1) you are not looking at the right set of frequencies and you need to fix your regulatory domain, or (2) you don't have a working antenna on the port you are trying to use, and need to pass a parameter to change ports.

My suggested experiment is trying to narrow that list to one.

Arch Linux

#1 2018-08-27 08:35:00

bcm43142 doesn't support 5ghz freq

#2 2018-08-27 15:03:50

Re: bcm43142 doesn't support 5ghz freq

#3 2018-08-28 09:05:20

Re: bcm43142 doesn't support 5ghz freq

#4 2018-08-28 14:26:21

Re: bcm43142 doesn't support 5ghz freq

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