So I am currently running UBUNTU 21.10 on my HTPC that has TP-LINK TL-WN781ND PCIe WIFI card (with a Qualcomm Atheros AR9485 chipset, so the V2 version as newer ones use a Realtek one IIRC)
It gets detected by the system and I can see my neighbors network but not my own. On my laptop which also runs Ubuntu 21.10 and has an Intel chipset I do see my personal network without any issue and my workstation that is running WIN11 pro with an TP-LINK TL-WN881ND V2 PCIe WIFI card (which has a Realtek chip) also has no issues and as I live in a rural area I only see my own network and my neighbors network, so channel saturation shouldn't be an issue either.
I have tried manually adding the network using Hidden network and WPA2 Personal (as that is the security that it is using) without any luck. The system is currently for reinstalling/testing purposes next to my workstation which is currently connected to the WIFI network without any issue and as the WIFI router/modem is in the same room there also is not an issue with signal strength or quality. The HTPC was running Win11 Pro (and Win 10 Pro before that) also without any issues using the WIFI network.
As I am pretty much a Linux noob I have no clue what is happening right now, I am running the latest stable XanMOD kernel but the problem also exists during a clean installation... My Workstation can see the network running 21.10 live, my laptop running Ubuntu 21.10 installed can see the network during installation, but even when running the installer my HTPC doesn't, but it DOES find my neighbors network...
Specs PC:
Intel Pentium G4560 CPU
2*8GB 2400MHz DDR4 RAM
MSI PC MATE H270 Mainboard
nVIDIA GeForce GTX1650 GPU
TP-LINK TL-WN781ND PCIe WIFI card
Trancend 220s 256GB M.2 NVMe drive
Cooler Master Master Power 500W PSU
