Summary; my own rtl8821ae frequent connection lost problem was fixed by
upstream patch b8b8b16352cd ("rtlwifi: rtl8821ae: Fix connection lost
problem") merged for 4.14-rc4.
I've recently fixed a problem very much like the problems reported in
this bug; and during my tests I saw the cycling ping times, the delay
unloading the module, and the no buffer space, all of which suggested a
firmware hang in the wireless device.
My main problem was that connection was lost shortly after it was made,
and especially if there was a burst of download data. Workaround was to
turn wireless off then on again, or reboot.
What I did was
(a) test several ubuntu kernels to find which ones were affected,
(b) using git bisect, tested several custom kernels, and proved my
problem began with a single commit 40b368af4b75 ("rtlwifi: Fix alignment
issues"),
(c) worked with upstream to determine a likely cause; the commit wasn't
widely tested,
(d) proved through testing that the BIOS can have an effect; because the
rtl8821ae driver does not reset the card, but inherits the card in
whatever state the BIOS left it. This can randomise problem reports.
(e) proved that a power down and reboot can have a different effect to a
warm reboot; some of the wireless card device registers are unchanged on
warm reboot. This can randomise problem reports.
Hope that helps.
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https://bugs.launchpad.net/bugs/1618267
Title:
RTL8821AE abruptly halts all network traffic
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