Here I have an USB 3.0 wifi adapter (Netgear A6210) which has always worked flawlessly on Windows: high gain (I can also catch long distance access points) and very stable connection.
Long story short: I discovered that on Kernel 4.14 is not recognized: the support for such device start on Kernel 4.19 by using the driver mt76x2u: https://cateee.net/lkddb/web-lkddb/MT76x2U.html
The USB adapter here on Linux connects to the router with a ridicolous link speed: 43 MB/s at max despite the facts that I have USB 3.0 ports, and the worst thing is that after a while it cause a complete system freeze, as example as reported here http://www.draisberghof.de/usb_modeswitch/bb/viewtopic.php?f=4&t=2830&view=next where such user said “ With kernel 4.19 and later you will have to blacklist the in-kernel driver first, because it doesn't work, even worse - it crashed my kernel. For this create a file name /etc/modprobe.d/mt76x2u.conf with a single line inside: blacklist mt76x2u”
Obviouly I don’t wanna blacklist the driver for two reason: the first is that I need a powerful, functional and stable USB AC Wifi adapter, the second is that my old laptop (Ivy Bridge) works better with the kernel 4.14 (eg: the sleep/suspend doesn’t hangs).
I also tried to build and install the driver from here: https://github.com/kaduke/Netgear-A6210 which build and install fine, but the USB wifi adapter acts at the same way: it connects to the router with a ridicolous link speed and furthermore, when I reboot the system, on the console I get the famous message “a stop job is running” about TLP, NetworkManager and WPA supplicant which never ends and I have to shutdown the system by keep pressing the power switch on the laptop.
By searching something similar I was looking at the top model from netgear: A7000:
https://www.netgear.com/support/product/A7000.aspx which from my research should be provided with the rtl8814au chipset.
So I ask: is rtl8814au compatible with kernel 4.14 (ATM I have 4.14.155-1-MANJARO on stable branch), but most important: is stable and reliable?
If i search on pamac i see that on AUR there is available the rtl8814au-dkms-git driver ( RTL8814AU and RTL8813AU chipset driver with firmware v4.3.21) but I don’t know if is already available inside the Kernel.
By looking at github page https://github.com/zebulon2/rtl8814au the author claims “Updated with support for kernels >= 4.14.”
Furthermore there is also another version: https://github.com/tpircher/rtl8814AU
Some hints/suggestions? I am puzzled.
May I ask also to @tbg? On the forum he seems an expert user about these arguments