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[Bug 1572698] [NEW] Slow speed and dropped connections with Realtek RTL8192CU-based wifi


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I am using a D-Link DWA-131 USB wlan adapter to connect to my private wlan.
The adapter works fine under Windows and I have no problems connecting to my wlan with other devices (e.g. my laptop running Linux Mint).
However, the adapter, which is based on the Realtek rtl8192cu chipset, won't work correctly on any current Ubuntu machine (in my case Kubuntu 15.10 64bit):

As also showcased by a myriad of other bug reports (most of which have expired by now), wlan-adapters based on the Realtek rtl8192cu chipset exhibit very slow connection speeds and frequently dropped connections with current Linux kernels.
I have noticed this originally in Linux Mint 17 running kernel 3.19.x, in Kubuntu 15.10 up to and can confirm that it is still present in a live session of Xenial Xerus (16.04).
I have tried commonly mentioned "fixes" such as deactivating hardware encryption without success.

The drivers available on the Realtek homepage are apparently intended
for older kernels and won't install.

There is, however, a fixed driver available via github (https://github.com/pvaret/rtl8192cu-fixes).
I have followed the instructions found there and finally my wlan-adapter is working correctly.
Apparently the issues caused by the broken driver in the linux kernels might be connected to power management.

I am posting this bug here in the hope that some developer finally
manages to incorporate the (obviously available) fixes found in the
github-drivers into the drivers already included in the kernel.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: bot-comment rtl8192cu wifi wily wlan
Slow speed and dropped connections with Realtek RTL8192CU-based wifi
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