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[bingo <1572698@xxxxxxxxxxxxxxxxxx>]

@Patrick:
Well, thank you very much for your offer. I am surprised nothing has changed given that the bug appears to have been around for some time.

For the time being I have switched back to an adapter using the Atheros
AR7010+AR9287 chipset, which used to have a problem in the past and was
the main reason to get an RTL8192cu based adapter in the first place.

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https://bugs.launchpad.net/bugs/1572698

Title:
  Slow speed and dropped connections with Realtek RTL8192CU-based wifi

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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 4.2.0.35 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.
  --- 
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  patrick    2300 F.... pulseaudio
   /dev/snd/controlC1:  patrick    2300 F.... pulseaudio
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=28c49a78-8b93-495e-bc1b-22c87db4734c
  InstallationDate: Installed on 2015-10-22 (181 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Gigabyte Technology Co., Ltd. GA-870A-UD3
  NonfreeKernelModules: fglrx
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic root=UUID=1016b861-fa27-4990-bac9-58a3ab27ff5b ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.149.3
  RfKill:
   
  Tags:  wily
  UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
  Uname: Linux 4.2.0-35-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 08/01/2011
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F5
  dmi.board.name: GA-870A-UD3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF5:bd08/01/2011:svnGigabyteTechnologyCo.,Ltd.:pnGA-870A-UD3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-870A-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-870A-UD3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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