AC1200 Wireless Adapters

Finding an adapter
Browse to https://wikidevi.com/wiki/Special:RunQuery/Wireless_adapter_query.

Find "Supported 802dot11 protocols:", enter abgn+ac.

Find "Table query type:", select linux_support.

Click "Run query".

Scroll down to find a table of known abgn+ac Wireless Adapters with chipset, pciid, and possible linux driver. The AC1200 adapters in the table will have RTL8812AU or BCM43526 chipsets. The other chipsets listed support other protocols.

Finding and installing a driver
Drivers for pcie connected Realtek 8723/8812/8821 adapters are in kernel-3.17.8 and later. Driver 8812au for Realtek usb chipsets is available at https://github.com/gnab/rtl8812au. Download and extract the zip file, cd to the extracted directory (/path/to/rtl8812au-master). Ensure the AC1200 is not installed. Follow the instructions provided in README.md. Install the adapter.

wl 6 is in portage as broadcomm-sta, but support of bcm4352 and bcm43526 is very unlikely. The BCM43526 is not in the supported device list at http://www.broadcom.com/docs/linux_sta/README_6.30.223.248.txt. Using ndiswrapper and 32 bit windows files may work. 64 bit windows files do not. As the BCM43526 adapters are usb2.0, 480 mbps, they should be unable to support the theoretical 867 mbps of the 5 ghz channels.

Kernel
-*- Networking support --->

-*- Wireless --->

-M- cfg80211 - wireless configuration API

[*] cfg80211 wireless extensions compatibility

 Generic IEEE 802.11 Networking Stack (mac80211)

  RF switch subsystem support

Device Drivers --->

[*] Network device support --->

[*]  Wireless LAN  --->

  Realtek rtlwifi family of devices  --->

--- Realtek rtlwifi family of devices

  Realtek RTL8821AE/RTL8812AE Wireless Network Adapter

  Realtek RTL8192CU/RTL8188CU USB Wireless Network Adapter

[*] Staging drivers --->

  Support for rtllib wireless devices

    Support for rtllib CCMP crypto

    Support for rtllib TKIP crypto

    Support for rtllib WEP crypto

  Realtek RTL8723AU Wireless LAN NIC driver

[*]    Realtek RTL8723AU AP mode

[*]    Realtek RTL8723AU BlueTooth Coexistence

The Linksys WUSB6300 802.11a/b/g/n/ac Wireless Adapter Windows 8 and 8.1 drivers fail. A simple working solution exists at https://community.linksys.com/t5/Wireless-Adapters/WUSB6300-Windows-8-1-Wifi-problems/m-p/791422#M33288. Summarized: Control Panel/Device Manager/Network adapters/Linksys WUSB6300/Properties/Advanced/QoS Support/Value needs to be set to "Not Support QoS".