For the records, I am having this very same problem with e TP-Link TL-
WN821N, shipped with a rtl8192cu chipset.

I have recompiled the kernel enabling Jes Sorensen driver,

## file: drivers/net/wireless/realtek/rtl8xxxu/Kconfig
##
CONFIG_RTL8XXXU=m
CONFIG_RTL8XXXU_UNTESTED=y

and added this line to a file under /etc/modprobe.d

alias usb:v0BDAp8178d*dc*dsc*dp*icFFiscFFipFFin* rtl8xxxu

If the dongle is initially connected, system loads the module when
booting but seems not to initialize the dongle, so I have no connection.
However, if I disconnect the dongle and reconnect it again with the
system on, everything seems to work well, no connection dropping. Only
minimally tested, but apart from the boot problem apparently much better
that with the built-in rtl8192cu kernel module.

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https://bugs.launchpad.net/bugs/1365844

Title:
  0bda:8178 buggy driver rtl8192cu

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