not working with 5GHz

[feshchenkod]

All installed and working fine on 2.4GHz, but 5GHz wifi not showing up in list.

Installed with dkms (tried this version too - https://github.com/cilynx/rtl88x2bu)
The devide is TP-Link Archer T4U V3.
System: ubuntu 18.04 (5.3.0-28-generic) and 19.10 (5.3.0-29-generic).

[feshchenkod]

sudo iwconfig wlxd037455a04b0 chan 140
iwlist chan

wlxd037455a04b0 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=5.7 GHz (Channel 140)

But still no 5G wifi in gui list.

[mwoelke]

I'm having the same problem with the exact same device.
I installed https://github.com/cilynx/rtl88x2bu on Kernel 5.5.7, but didn't want to open up a new issue on the other repo, since this should be related.

I used this driver in the past https://github.com/jeremyb31/rtl8822bu which used to work with 5GHz up until 5.4.something just fine (can't get this one to work on newer kernels).

Can provide more info/logs if required.

[feshchenkod]

My bad, I did found the answer. It's works fine with 5Ghz on ubuntu 18 and 19. I just changed channel on my router from auto to 40. My laptop and smart phonefound auto channel, but this adapter not.

[mwoelke]

Thank you for posting your fix!
No luck there for me unfortunately, tried a lot of different channels just now...

Here is the output of iw list, showing that band 2 with 5GHz should be in fact supported (if I interpret it correctly):

`

    max # scan SSIDs: 9
    max scan IEs length: 2304 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)
    Supported Ciphers:
            * WEP40 (00-0f-ac:1)
            * WEP104 (00-0f-ac:5)
            * TKIP (00-0f-ac:2)
            * CCMP-128 (00-0f-ac:4)
    Available Antennas: TX 0 RX 0
    Supported interface modes:
             * IBSS
             * managed
             * AP
             * P2P-client
             * P2P-GO
    Band 1:
            Capabilities: 0x1963
                    RX LDPC
                    HT20/HT40
                    Static SM Power Save
                    RX HT20 SGI
                    RX HT40 SGI
                    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 Max RX data rate: 300 Mbps
            HT TX/RX MCS rate indexes supported: 0-15
            Bitrates (non-HT):
                    * 1.0 Mbps
                    * 2.0 Mbps
                    * 5.5 Mbps
                    * 11.0 Mbps
                    * 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] (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) (no IR)
                    * 2472 MHz [13] (20.0 dBm)
                    * 2484 MHz [14] (disabled)
    Band 2:
            Capabilities: 0x1863
                    RX LDPC
                    HT20/HT40
                    Static SM Power Save
                    RX HT20 SGI
                    RX HT40 SGI
                    No RX STBC
                    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 Max RX data rate: 300 Mbps
            HT TX/RX MCS rate indexes supported: 0-15
            VHT Capabilities (0x03d071b2):
                    Max MPDU length: 11454
                    Supported Channel Width: neither 160 nor 80+80
                    RX LDPC
                    short GI (80 MHz)
                    TX STBC
                    SU Beamformee
                    MU Beamformee
                    +HTC-VHT
            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: 867 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: 867 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:
                    * 5180 MHz [36] (30.0 dBm)
                    * 5200 MHz [40] (30.0 dBm)
                    * 5220 MHz [44] (30.0 dBm)
                    * 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] (disabled)
                    * 5765 MHz [153] (disabled)
                    * 5785 MHz [157] (disabled)
                    * 5805 MHz [161] (disabled)
                    * 5825 MHz [165] (disabled)
                    * 5845 MHz [169] (disabled)
                    * 5865 MHz [173] (disabled)
                    * 5885 MHz [177] (disabled)
    Supported commands:
             * new_interface
             * set_interface
             * new_key
             * start_ap
             * new_station
             * set_bss
             * join_ibss
             * set_pmksa
             * del_pmksa
             * flush_pmksa
             * remain_on_channel
             * frame
             * set_channel
             * connect
             * disconnect
    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
    Supported RX frame types:
             * IBSS: 0xd0
             * managed: 0x40 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
    WoWLAN support:
             * wake up on anything (device continues operating normally)
    software interface modes (can always be added):
    interface combinations are not supported
    Device supports scan flush.
    Supported extended features:

`

[mwoelke]

After further tests with another wifi router 5GHz wifi actually seems to be working, it should be a router problem.

Maybe range is weaker compared to the other driver I've been using before, but I have no way to test that.

Can be closed I guess.