Enable WiFi 5GHz Channels 100-140

VIM4
1

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu 22.04

Which version of system do you use? Khadas official images, self built images, or others?

Khadas official image: vim4-ubuntu-22.04-gnome-linux-5.4-fenix-1.5-230425.img

Please describe your issue below:

I am trying to connect to an enterprise WiFi broadcasted on WiFi channels 100-140, but on the Khadas VIM4, these channels seem to be disabled (see log from ‘iw list’ below).

Is there a way to enable these WiFi channel for the Khadas VIM4? The WiFi module should support them.

Post a console log of your issue below:

iw list
Wiphy phy0
        wiphy index: 0
        max # scan SSIDs: 10
        max scan IEs length: 2048 bytes
        max # sched scan SSIDs: 0
        max # match sets: 0
        max # scan plans: 1
        max scan plan interval: -1
        max scan plan iterations: 0
        Retry short limit: 7
        Retry long limit: 4
        Coverage class: 0 (up to 0m)
        Device supports roaming.
        Device supports T-DLS.
        Supported Ciphers:
                * WEP40 (00-0f-ac:1)
                * WEP104 (00-0f-ac:5)
                * TKIP (00-0f-ac:2)
                * CCMP-128 (00-0f-ac:4)
                * CMAC (00-0f-ac:6)
                * GMAC-256 (00-0f-ac:12)
                * GMAC-128 (00-0f-ac:11)
                * CMAC-256 (00-0f-ac:13)
                * 00-90-4c:0
        Available Antennas: TX 0 RX 0
        Supported interface modes:
                 * IBSS
                 * managed
                 * AP
                 * P2P-client
                 * P2P-GO
                 * P2P-device
        Band 1:
                Capabilities: 0x1020
                        HT20
                        Static SM Power Save
                        RX HT20 SGI
                        No RX STBC
                        Max AMSDU length: 3839 bytes
                        DSSS/CCK HT40
                Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
                Minimum RX AMPDU time spacing: 16 usec (0x07)
                HT RX MCS rate indexes supported: 0-7
                HT TX MCS rate indexes are undefined
                Bitrates (non-HT):
                        * 1.0 Mbps
                        * 2.0 Mbps (short preamble supported)
                        * 5.5 Mbps (short preamble supported)
                        * 11.0 Mbps (short preamble supported)
                        * 6.0 Mbps
                        * 9.0 Mbps
                        * 12.0 Mbps
                        * 18.0 Mbps
                        * 24.0 Mbps
                        * 36.0 Mbps
                        * 48.0 Mbps
                        * 54.0 Mbps
                Frequencies:
                        * 2412 MHz [1] (30.0 dBm)
                        * 2417 MHz [2] (30.0 dBm)
                        * 2422 MHz [3] (30.0 dBm)
                        * 2427 MHz [4] (30.0 dBm)
                        * 2432 MHz [5] (30.0 dBm)
                        * 2437 MHz [6] (30.0 dBm)
                        * 2442 MHz [7] (30.0 dBm)
                        * 2447 MHz [8] (30.0 dBm)
                        * 2452 MHz [9] (30.0 dBm)
                        * 2457 MHz [10] (30.0 dBm)
                        * 2462 MHz [11] (30.0 dBm)
                        * 2467 MHz [12] (30.0 dBm)
                        * 2472 MHz [13] (30.0 dBm)
                        * 2484 MHz [14] (disabled)
        Band 2:
                Capabilities: 0x1020
                        HT20
                        Static SM Power Save
                        RX HT20 SGI
                        No RX STBC
                        Max AMSDU length: 3839 bytes
                        DSSS/CCK HT40
                Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
                Minimum RX AMPDU time spacing: 16 usec (0x07)
                HT RX MCS rate indexes supported: 0-7
                HT TX MCS rate indexes are undefined
                VHT Capabilities (0x0f815832):
                        Max MPDU length: 11454
                        Supported Channel Width: neither 160 nor 80+80
                        RX LDPC
                        short GI (80 MHz)
                        SU Beamformer
                        SU Beamformee
                VHT RX MCS set:
                        1 streams: MCS 0-9
                        2 streams: MCS 0-9
                        3 streams: not supported
                        4 streams: not supported
                        5 streams: not supported
                        6 streams: not supported
                        7 streams: not supported
                        8 streams: not supported
                VHT RX highest supported: 0 Mbps
                VHT TX MCS set:
                        1 streams: MCS 0-9
                        2 streams: MCS 0-9
                        3 streams: not supported
                        4 streams: not supported
                        5 streams: not supported
                        6 streams: not supported
                        7 streams: not supported
                        8 streams: not supported
                VHT TX highest supported: 0 Mbps
                Bitrates (non-HT):
                        * 6.0 Mbps
                        * 9.0 Mbps
                        * 12.0 Mbps
                        * 18.0 Mbps
                        * 24.0 Mbps
                        * 36.0 Mbps
                        * 48.0 Mbps
                        * 54.0 Mbps
                Frequencies:
                        * 5170 MHz [34] (disabled)
                        * 5180 MHz [36] (30.0 dBm)
                        * 5190 MHz [38] (disabled)
                        * 5200 MHz [40] (30.0 dBm)
                        * 5210 MHz [42] (disabled)
                        * 5220 MHz [44] (30.0 dBm)
                        * 5230 MHz [46] (disabled)
                        * 5240 MHz [48] (30.0 dBm)
                        * 5260 MHz [52] (30.0 dBm) (no IR, radar detection)
                        * 5280 MHz [56] (30.0 dBm) (no IR, radar detection)
                        * 5300 MHz [60] (30.0 dBm) (no IR, radar detection)
                        * 5320 MHz [64] (30.0 dBm) (no IR, radar detection)
                        * 5500 MHz [100] (disabled)
                        * 5520 MHz [104] (disabled)
                        * 5540 MHz [108] (disabled)
                        * 5560 MHz [112] (disabled)
                        * 5580 MHz [116] (disabled)
                        * 5600 MHz [120] (disabled)
                        * 5620 MHz [124] (disabled)
                        * 5640 MHz [128] (disabled)
                        * 5660 MHz [132] (disabled)
                        * 5680 MHz [136] (disabled)
                        * 5700 MHz [140] (disabled)
                        * 5720 MHz [144] (disabled)
                        * 5745 MHz [149] (30.0 dBm)
                        * 5765 MHz [153] (30.0 dBm)
                        * 5785 MHz [157] (30.0 dBm)
                        * 5805 MHz [161] (30.0 dBm)
                        * 5825 MHz [165] (30.0 dBm)
        Supported commands:
                 * new_interface
                 * set_interface
                 * new_key
                 * start_ap
                 * set_bss
                 * join_ibss
                 * set_pmksa
                 * del_pmksa
                 * flush_pmksa
                 * remain_on_channel
                 * frame
                 * frame_wait_cancel
                 * set_wiphy_netns
                 * set_channel
                 * tdls_mgmt
                 * tdls_oper
                 * start_p2p_device
                 * connect
                 * disconnect
                 * channel_switch
                 * update_connect_params
                 * update_ft_ies
        Supported TX frame types:
                 * IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
                 * managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
                 * AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
                 * AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
                 * P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
                 * P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
                 * P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
        Supported RX frame types:
                 * IBSS: 0xd0
                 * managed: 0x40 0xb0 0xd0
                 * AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
                 * AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
                 * P2P-client: 0x40 0xd0
                 * P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
                 * P2P-device: 0x40 0xd0
        WoWLAN support:
                 * wake up on anything (device continues operating normally)
                 * wake up on pattern match, up to 8 patterns of 1-255 bytes,
                   maximum packet offset 255 bytes
        software interface modes (can always be added):
        valid interface combinations:
                 * #{ AP } <= 2, #{ managed } <= 4, #{ P2P-client, P2P-GO } <= 2, #{ P2P-device } <= 1, #{ IBSS } <= 1,
                   total <= 5, #channels <= 2
        Device supports SAE with AUTHENTICATE command
        Device supports low priority scan.
        Device supports scan flush.
        Supported extended features:
                * [ FILS_SK_OFFLOAD ]: FILS shared key authentication offload
                * [ LOW_SPAN_SCAN ]: low span scan
                * [ LOW_POWER_SCAN ]: low power scan
                * [ HIGH_ACCURACY_SCAN ]: high accuracy scan
2

Hello @stuffen

Where are you from? Does 100-140 channels available in your country？

3

I am based in Switzerland and channels 100-140 are allowed. I also tried setting the country with iw reg set CH and it also applied this properly, but the channels still seem to be disabled.

4

Hello @stuffen

Okay, you can try to setup the country to Switzerland, just follow the steps below.

$ echo ccode=SZ | sudo tee -a /lib/firmware/brcm/config_bcm43752a2_ag.txt
$ echo regrev=0 | sudo tee -a /lib/firmware/brcm/config_bcm43752a2_ag.txt
$ sync

Check the configuration file again, it should be like below:

$ cat /lib/firmware/brcm/config_bcm43752a2_ag.txt
wl_preinit=pm2_sleep_ret=2000
ccode=SZ
regrev=0

Then reboot the board.

$ sync
$ sudo reboot

Check the Wi-Fi country code:

$ dmesg | grep Country
[   11.786510] [dhd] dhd_conf_set_country : Country code: SZ (SZ/0)
khadas@Khadas:~$

Check the channels, you will find 100-140 channels enabled.

$ sudo iw list | grep MHz
                        * 2412 MHz [1] (20.0 dBm)
                        * 2417 MHz [2] (20.0 dBm)
                        * 2422 MHz [3] (20.0 dBm)
                        * 2427 MHz [4] (20.0 dBm)
                        * 2432 MHz [5] (20.0 dBm)
                        * 2437 MHz [6] (20.0 dBm)
                        * 2442 MHz [7] (20.0 dBm)
                        * 2447 MHz [8] (20.0 dBm)
                        * 2452 MHz [9] (20.0 dBm)
                        * 2457 MHz [10] (20.0 dBm)
                        * 2462 MHz [11] (20.0 dBm)
                        * 2467 MHz [12] (20.0 dBm)
                        * 2472 MHz [13] (20.0 dBm)
                        * 2484 MHz [14] (disabled)
                        short GI (80 MHz)
                        * 5170 MHz [34] (disabled)
                        * 5180 MHz [36] (30.0 dBm)
                        * 5190 MHz [38] (disabled)
                        * 5200 MHz [40] (30.0 dBm)
                        * 5210 MHz [42] (disabled)
                        * 5220 MHz [44] (30.0 dBm)
                        * 5230 MHz [46] (disabled)
                        * 5240 MHz [48] (30.0 dBm)
                        * 5260 MHz [52] (30.0 dBm) (no IR, radar detection)
                        * 5280 MHz [56] (30.0 dBm) (no IR, radar detection)
                        * 5300 MHz [60] (30.0 dBm) (no IR, radar detection)
                        * 5320 MHz [64] (30.0 dBm) (no IR, radar detection)
                        * 5500 MHz [100] (30.0 dBm) (no IR, radar detection)
                        * 5520 MHz [104] (30.0 dBm) (no IR, radar detection)
                        * 5540 MHz [108] (30.0 dBm) (no IR, radar detection)
                        * 5560 MHz [112] (30.0 dBm) (no IR, radar detection)
                        * 5580 MHz [116] (30.0 dBm) (no IR, radar detection)
                        * 5600 MHz [120] (30.0 dBm) (no IR, radar detection)
                        * 5620 MHz [124] (30.0 dBm) (no IR, radar detection)
                        * 5640 MHz [128] (30.0 dBm) (no IR, radar detection)
                        * 5660 MHz [132] (30.0 dBm) (no IR, radar detection)
                        * 5680 MHz [136] (30.0 dBm) (no IR, radar detection)
                        * 5700 MHz [140] (30.0 dBm) (no IR, radar detection)
                        * 5720 MHz [144] (disabled)
                        * 5745 MHz [149] (30.0 dBm)
                        * 5765 MHz [153] (30.0 dBm)
                        * 5785 MHz [157] (30.0 dBm)
                        * 5805 MHz [161] (30.0 dBm)
                        * 5825 MHz [165] (30.0 dBm)

As I can’t check these channel functions on my side, please check on your side and let us know whether it works.

5

Your instructions worked! Thanks!