[Bug 252725] Realtek RTL8821AU/TP-Link T2U Nano: Frequent disconnects on Intel Tiger Lake

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252725

            Bug ID: 252725
           Summary: Realtek RTL8821AU/TP-Link T2U Nano: Frequent
                    disconnects on Intel Tiger Lake
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: nc at FreeBSD.org

When using a Realtek RTL8821AU/TP-Link T2U Nano on a HP Spectre x360 13t-aw200
(TigerLake) running 13-ALPHA1 6483fc224b1, I get frequent disconnections and
resets:

dmesg log:

rtwn0: device timeout
wlan0: link state changed to DOWN
rtwn0: ieee80211_crypto_encap returns NULL.
wlan0: ieee80211_new_state_locked: pending ASSOC -> RUN transition lost

This does not happen on the said Spectre with a CanaKit/Ralink dongle, or the
same TP-Link dongle on an older HP Spectre x360 13-ap0053dx (WhiskeyLake). The
latter case was used with older 13-CURRENT kernels, however.

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