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This is somewhat a duplicate of Ubuntu 18.04 don´t show 5ghz wifi. But first there might be some differences and second it isn't solved (the answer on the other post is not understandable to me and not accepted by the contributor).

I have a FritzBox 7530 which broadcasts on 2.4 and 5 Ghz simultaneously. I assigned each of them a different name and in the Wi-Fi-Tab in the "Settings" only the 2.4Ghz network is showing up. The currently connected network is the 2.4ghz one. The 5Ghz is named the same but with a 2 at the end. I am using a CSL AC1200 WLAN Adapter AC1200 (https://www.amazon.de/-/en/dp/B01M67XBJ4/ref=psdc_1626220031_t1_B01MR2X5OA) which is supposed to support both 2.4 and 5Ghz. Strangely I am able so see 5Ghz networks in the fritz.box-browser-interface which should be detected by the same adapter. As you can see the networks o2-WLAN84 and o2-WLAN60 are detected at 2.4 and 5Ghz in the browser interface.

I already tried setting the domain "DE" in etc/default/crda.

lspci |grep -i net gives

05:00.0 Ethernet controller: Qualcomm Atheros Killer E220x Gigabit Ethernet Controller (rev 10)

and iwlist chan gives

enp5s0    no frequency information.

wlx24050ff6bb2c  17 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
          Current Frequency:2.462 GHz (Channel 11)

lo        no frequency information.

I don't have any issues seeing and connecting to my 2.4Ghz network.

Edit 1

output for my adapter from lsusb

Bus 007 Device 002: ID 0bda:8812 Realtek Semiconductor Corp. RTL8812AU 802.11a/b/g/n/ac WLAN Adapter

Edit 2

I tried the permanent fix from heynnema at WiFi module 8812AU not working with kernel version >= 4.4.0-28-generic and restarted the PC but nothing changed.

Any help is appreciated. Thank you.

Thomas
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