[Milhouse]

Still having trouble to use channel 13 for WIFI.
Is there a setting for WIFI country, or any way to enable channel 12/13

This is most likely a configuration issue with your access point - if your AP is not announcing a country code then the Linux kernel in LibreELEC won't know which channels it is permitted to use so it will default to the most restrictive "global" regulatory configuration (country code 00, channels 1-11).

See this discussion for more details.

Install "Network Tools" from the LibreELEC Repository and you can check if your AP is announcing a country code:

Code:

iw dev wlan0 scan

For example my Netgear DGND4000 access point is not transmitting a country code, but one of my neighbours is:

Code:

BSS xx:xx:xx:xx:xx:xx(on wlan0)
        TSF: 0 usec (0d, 00:00:00)
        freq: 2462
        beacon interval: 100 TUs
        capability: ESS Privacy ShortSlotTime (0x0411)
        signal: -83.00 dBm
        last seen: 0 ms ago
        SSID: TALKTALK17xxxx
        Supported rates: 1.0* 2.0* 5.5* 11.0* 6.0 9.0 12.0 18.0
        DS Parameter set: channel 11
        ERP: <no flags>
        Extended supported rates: 24.0 36.0 48.0 54.0
        HT capabilities:
                Capabilities: 0x198e
                        HT20/HT40
                        SM Power Save disabled
                        TX STBC
                        RX STBC 1-stream
                        Max AMSDU length: 7935 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: 0-15
                HT TX MCS rate indexes are undefined
        HT operation:
                 * primary channel: 11
                 * secondary channel offset: no secondary
                 * STA channel width: 20 MHz
                 * RIFS: 0
                 * HT protection: no
                 * non-GF present: 0
                 * OBSS non-GF present: 0
                 * dual beacon: 0
                 * dual CTS protection: 0
                 * STBC beacon: 0
                 * L-SIG TXOP Prot: 0
                 * PCO active: 0
                 * PCO phase: 0
        Overlapping BSS scan params:
                 * passive dwell: 20 TUs
                 * active dwell: 10 TUs
                 * channel width trigger scan interval: 180 s
                 * scan passive total per channel: 200 TUs
                 * scan active total per channel: 20 TUs
                 * BSS width channel transition delay factor: 5
                 * OBSS Scan Activity Threshold: 0.25 %
        Extended capabilities: HT Information Exchange Supported
        WPA:     * Version: 1
                 * Group cipher: TKIP
                 * Pairwise ciphers: TKIP CCMP
                 * Authentication suites: PSK
        RSN:     * Version: 1
                 * Group cipher: TKIP
                 * Pairwise ciphers: TKIP CCMP
                 * Authentication suites: PSK
                 * Capabilities: 1-PTKSA-RC 1-GTKSA-RC (0x0000)
        WMM:     * Parameter version 1
                 * BE: CW 15-1023, AIFSN 3
                 * BK: CW 15-1023, AIFSN 7
                 * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
                 * VO: CW 3-7, AIFSN 2, TXOP 1504 usec
        Country: GB     Environment: Indoor/Outdoor
                Channels [1 - 13] @ 20 dBm
        WPS:     * Version: 1.0
                 * Wi-Fi Protected Setup State: 2 (Configured)
                 * Response Type: 3 (AP)
                 * UUID: 63041253-1019-2006-1228-50a72b17f378
                 * Manufacturer: Realtek Semiconductor Corp.
                 * Model: RTL8xxx
                 * Model Number: EV-2010-09-20
                 * Serial Number: 123456789012347
                 * Primary Device Type: 6-0050f204-1
                 * Device name: ADSL Modem/Router
                 * Config methods: PBC
                 * Unknown TLV (0x1049, 6 bytes): 00 37 2a 00 01 20

Another neighbour has thinks he is in America, even though we are both in the UK...

Code:

Country: US     Environment: Indoor only
                Channels [1 - 11] @ 27 dBm

However most of the APs that I can "see" do NOT announce any country code, so any connecting (Linux) client will default to regulatory domain 00 (ie. global).

To force a specific regulatory domain/country, you can try (on your LibreELEC client):

Code:

echo "options cfg80211 ieee80211_regdom=GB" > /etc/modprobe.d/cfg80211.conf
reboot

(change GB to whatever is appropriate for your location - see country codes)

To see which frequencies are currently supported by your LibreELEC client:

Code:

iwlist wlan0 frequency

So for my RPi3, before forcing the regulatory domain to GB:

Code:

rpi22:~ # iwlist wlan0 frequency
wlan0     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:2.447 GHz (Channel 8)

and then afterwards once I had forced the regulatory domain to GB:

Code:

rpi22:~ # iwlist wlan0 frequency
wlan0     13 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
          Current Frequency:2.447 GHz (Channel 8)

Forcing a specific regulatory domain is not likely to be something that will be implemented or even needs fixing in LibreELEC - if the AP you are connected to is not announcing the correct regulatory domain (ie. country) then the current default behaviour ("global") is entirely correct. In such circumstances you will have to manually configure the regulatory domain/country in /etc/modprobe.d/cfg80211.conf.