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Thread: Intel 3168NGW not using full 5GHz channel width

  1. #1
    Join Date
    Aug 2021
    Beans
    2

    Intel 3168NGW not using full 5GHz channel width

    I've been having network performance issues in Ubuntu since installation.

    Wireless Network Card
    Code:
    ~$ lspci | grep "Network"
    29:00.0 Network controller: Intel Corporation Dual Band Wireless-AC 3168NGW [Stone Peak] (rev 10)
    Looking at the output, I noticed that the network adapter is only connecting to the channel with width 20 MHz.
    Code:
    ~$ iw dev wlp41s0 info 
    Interface wlp41s0
        ifindex 3
        wdev 0x1
        addr 98:8d:46:5a:16:34
        ssid home-wifi
        type managed
        wiphy 0
        channel 44 (5220 MHz), width: 20 MHz (no HT), center1: 5220 MHz
        txpower 22.00 dBm
        multicast TXQ:
            qsz-byt    qsz-pkt    flows    drops    marks    overlmt    hashcol    tx-bytes    tx-packets
            0    0    0    0    0    0    0    0        0
    I confirmed that the network AP seems to be setup correctly. Other Ubuntu devices are connecting properly using full available width (although with different wireless adapters).
    Code:
    ~$ sudo iw dev wlp41s0 scan ssid
    BSS cc:ab:2c:db:be:c9(on wlp41s0) -- associated
        last seen: 2739.005s [boottime]
        TSF: 3259641347 usec (0d, 00:54:19)
        freq: 5220
        beacon interval: 100 TUs
        capability: ESS Privacy SpectrumMgmt (0x0111)
        signal: -44.00 dBm
        last seen: 1136 ms ago
        Information elements from Probe Response frame:
        SSID: home-wifi
        Supported rates: 6.0* 9.0 12.0 18.0 24.0* 36.0 48.0 54.0 
        Country: US    Environment: Indoor/Outdoor
            Channels [36 - 36] @ 30 dBm
            Channels [40 - 40] @ 30 dBm
            Channels [44 - 44] @ 30 dBm
            Channels [48 - 48] @ 30 dBm
            Channels [52 - 52] @ 24 dBm
            Channels [56 - 56] @ 24 dBm
            Channels [60 - 60] @ 24 dBm
            Channels [64 - 64] @ 24 dBm
            Channels [100 - 100] @ 24 dBm
            Channels [104 - 104] @ 24 dBm
            Channels [108 - 108] @ 24 dBm
            Channels [112 - 112] @ 24 dBm
            Channels [116 - 116] @ 24 dBm
            Channels [120 - 120] @ 24 dBm
            Channels [124 - 124] @ 24 dBm
            Channels [128 - 128] @ 24 dBm
            Channels [132 - 132] @ 24 dBm
            Channels [136 - 136] @ 24 dBm
            Channels [140 - 140] @ 24 dBm
            Channels [144 - 144] @ 24 dBm
            Channels [149 - 149] @ 30 dBm
            Channels [153 - 153] @ 30 dBm
            Channels [157 - 157] @ 30 dBm
            Channels [161 - 161] @ 30 dBm
            Channels [165 - 165] @ 30 dBm
        Power constraint: 0 dB
        TPC report: TX power: 22 dBm
        RSN:     * Version: 1
             * Group cipher: CCMP
             * Pairwise ciphers: CCMP
             * Authentication suites: PSK
             * Capabilities: 16-PTKSA-RC 1-GTKSA-RC (0x000c)
        BSS Load:
             * station count: 3
             * channel utilisation: 16/255
             * available admission capacity: 0 [*32us]
        HT capabilities:
            Capabilities: 0x1ef
                RX LDPC
                HT20/HT40
                SM Power Save disabled
                RX HT20 SGI
                RX HT40 SGI
                TX STBC
                RX STBC 1-stream
                Max AMSDU length: 3839 bytes
                No DSSS/CCK HT40
            Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
            Minimum RX AMPDU time spacing: 4 usec (0x05)
            HT RX MCS rate indexes supported: 0-31
            HT TX MCS rate indexes are undefined
        HT operation:
             * primary channel: 44
             * secondary channel offset: above
             * STA channel width: any
             * RIFS: 0
             * HT protection: non-HT mixed
             * non-GF present: 1
             * OBSS non-GF present: 1
             * dual beacon: 0
             * dual CTS protection: 0
             * STBC beacon: 0
             * L-SIG TXOP Prot: 0
             * PCO active: 0
             * PCO phase: 0
        Extended capabilities:
             * Extended Channel Switching
             * BSS Transition
             * Interworking
             * QoS Map
             * Operating Mode Notification
             * Channel Schedule Management
             * Channel Schedule Management
             * 6
             * Max Number Of MSDUs In A-MSDU is 
        VHT capabilities:
            VHT Capabilities (0x0f8b69f5):
                Max MPDU length: 7991
                Supported Channel Width: 160 MHz
                RX LDPC
                short GI (80 MHz)
                short GI (160/80+80 MHz)
                TX STBC
                SU Beamformer
                MU Beamformer
            VHT RX MCS set:
                1 streams: MCS 0-9
                2 streams: MCS 0-9
                3 streams: MCS 0-9
                4 streams: MCS 0-9
                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: MCS 0-9
                4 streams: MCS 0-9
                5 streams: not supported
                6 streams: not supported
                7 streams: not supported
                8 streams: not supported
            VHT TX highest supported: 0 Mbps
        VHT operation:
             * channel width: 1 (80 MHz)
             * center freq segment 1: 42
             * center freq segment 2: 50
             * VHT basic MCS set: 0x0000
        WPS:     * Version: 1.0
             * Wi-Fi Protected Setup State: 2 (Configured)
             * Response Type: 3 (AP)
             * UUID: 
             * Manufacturer: Arris, Inc.
             * Model: BGW320-500
             * Model Number: BGW320-500
             * Serial Number: BGW320-500
             * Primary Device Type: 6-0050f204-1
             * Device name: Arris Wireless
             * Config methods: Display, Keypad
             * RF Bands: 0x3
             * Unknown TLV (0x1049, 6 bytes): 00 37 2a 00 01 20
        WMM:     * Parameter version 1
             * u-APSD
             * 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
        802.11u Advertisement:
            Query Response Info: 0x7f
                Query Response Length Limit: 127
                ANQP
    Interestingly enough, even though I am in the US, iwlist reports frequencies that shouldn't be available by regulation.
    Code:
    ~$ iwlist wlp41s0 freq
    wlp41s0   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
              Current Frequency:5.22 GHz (Channel 44)
    In /etc/default/crda, I set regdomain to US to try and make sure that the adapter is set to operate in the correct region, but didn't seem to change the above. I could not confirm from dmesg that the crda change was effective.
    Code:
    REGDOMAIN=US
    I also tried to set the frequency manually, but get a reply that the channel is disabled, making me believe that the region is incorrect still.
    Code:
    ~$ sudo iw wlp41s0 set freq 5220 80 5210
    kernel reports: (extension) channel is disabled
    command failed: Invalid argument (-22)
    I have also updated the Intel firmware in /lib/firmware using the latest downloaded from Intel.

    Any thoughts or recommendations on where to go next would be appreciated.

  2. #2
    Join Date
    Aug 2021
    Beans
    2

    Re: Intel 3168NGW not using full 5GHz channel width

    Quick note, output of iw get reg.
    Code:
    ~$ iw reg get
    global
    country US: DFS-FCC
        (2400 - 2472 @ 40), (N/A, 30), (N/A)
        (5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
        (5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
        (5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
        (5730 - 5850 @ 80), (N/A, 30), (N/A), AUTO-BW
        (5850 - 5895 @ 40), (N/A, 27), (N/A), NO-OUTDOOR, AUTO-BW, PASSIVE-SCAN
        (57240 - 71000 @ 2160), (N/A, 40), (N/A)
    
    phy#0 (self-managed)
    country US: DFS-UNSET
        (2402 - 2437 @ 40), (6, 22), (N/A), AUTO-BW, NO-HT40MINUS, NO-80MHZ, NO-160MHZ
        (2422 - 2462 @ 40), (6, 22), (N/A), AUTO-BW, NO-80MHZ, NO-160MHZ
        (2447 - 2482 @ 40), (6, 22), (N/A), AUTO-BW, NO-HT40PLUS, NO-80MHZ, NO-160MHZ
        (5170 - 5190 @ 80), (6, 22), (N/A), AUTO-BW, NO-HT40MINUS, NO-160MHZ
        (5190 - 5210 @ 80), (6, 22), (N/A), AUTO-BW, NO-HT40PLUS, NO-160MHZ
        (5210 - 5230 @ 80), (6, 22), (N/A), AUTO-BW, NO-HT40MINUS, NO-160MHZ
        (5230 - 5250 @ 80), (6, 22), (N/A), AUTO-BW, NO-HT40PLUS, NO-160MHZ
        (5250 - 5270 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
        (5270 - 5290 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
        (5290 - 5310 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
        (5310 - 5330 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
        (5490 - 5510 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
        (5510 - 5530 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
        (5530 - 5550 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
        (5550 - 5570 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
        (5570 - 5590 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
        (5590 - 5610 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
        (5610 - 5630 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
        (5630 - 5650 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
        (5650 - 5670 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
        (5670 - 5690 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
        (5690 - 5710 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40MINUS, NO-160MHZ, PASSIVE-SCAN
        (5710 - 5730 @ 80), (6, 22), (0 ms), DFS, AUTO-BW, NO-HT40PLUS, NO-160MHZ, PASSIVE-SCAN
        (5735 - 5755 @ 80), (6, 22), (N/A), AUTO-BW, NO-HT40MINUS, NO-160MHZ
        (5755 - 5775 @ 80), (6, 22), (N/A), AUTO-BW, NO-HT40PLUS, NO-160MHZ
        (5775 - 5795 @ 80), (6, 22), (N/A), AUTO-BW, NO-HT40MINUS, NO-160MHZ
        (5795 - 5815 @ 80), (6, 22), (N/A), AUTO-BW, NO-HT40PLUS, NO-160MHZ
        (5815 - 5835 @ 20), (6, 22), (N/A), AUTO-BW, NO-HT40MINUS, NO-HT40PLUS, NO-80MHZ, NO-160MHZ

  3. #3
    Join Date
    Mar 2007
    Location
    Promiseland
    Beans
    1,204
    Distro
    Xubuntu 20.04 Focal Fossa

    Re: Intel 3168NGW not using full 5GHz channel width

    Hello inewtons,

    I assume your issue is still unresolved; however, if you have discovered a resolution, please mark the thread as "solved".
    You are encouraged to "bump" if you have not received a reply within 24 hours.

    I have the very same intel 3168NGW [Stone Peak] wireless device. No issues since installation 17 months ago.

    Please go to this site and complete the suggestions even though you have already run some of the commands.
    https://ubuntuforums.org/showthread.php?t=370108

    One of the network SMEs will be along to advise on your issue.
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

  4. #4
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    25,631
    Distro
    Ubuntu Development Release

    Re: Intel 3168NGW not using full 5GHz channel width

    If this or any other networking SME had a single clue, we would have answered or at least guessed by now.

    The only thing I've found that is remotely promising is this: https://unix.stackexchange.com/quest...to-iw-set-freq

    I suggest that you try the parameters:

    Code:
    sudo -i
    echo "options iwlwifi 11n_disable=8 amsdu_size=3"  >>  /etc/modprobe.d/iwlwifi.conf
    modprobe -r iwlwifi
    modprobe iwlwifi
    exit
    I also suggest that the channel 44 be fixed in your router and certainly not auto channel select (code for, "Just when things are going well, I'll change my address. Catch me if you can!").

    Is there any improvement?
    Code:
     iw dev wlp41s0 info
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D., Sc.D.

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