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[Peter Schüller <1298802@xxxxxxxxxxxxxxxxxx>]

After some more testing with 3.14-rc8 I can confirm that the situation is just a tiny bit better than in the repository kernel:
* associating to the cellphone accesspoint does not always work and the syslog shows several attempts until it works if it works
* if the connection is there, it is unstable and sometimes disconnects with traffic
* packet loss and ping times are bad (see belowresults for pinging my personal homepage (hosted in switzerland) via my cellphone accesspoint

pinging from the computer with the 3.14-rc8 kernel and the WN8200ND
hardware: ping-8192cu.txt

--- www.peterschueller.com ping statistics ---
28 packets transmitted, 28 received, 0% packet loss, time 27045ms
rtt min/avg/max/mdev = 157.014/496.532/2018.405/510.937 ms, pipe 3

pinging from my laptop (centrino ultimate-n 6300 wifi card):

--- www.peterschueller.com ping statistics ---
29 packets transmitted, 21 received, 27% packet loss, time 28101ms
rtt min/avg/max/mdev = 367.968/867.568/4077.452/835.474 ms, pipe 5

So the average roundtrip is actually better with the 8192cu but the
deviation is greater and the packet loss is 27% compared to 0%.

Some more observations:
* the syslog shows frequent powersave messages, even if there is no extra traffic happening.
* if I provoke traffic by downloading a 1.2 MB file, the file is downloaded completely before syslog shows that it went out of powersave mode (although tail -f on the syslog file might not be the optimal way to do such a test)

short syslog excerpt

Mar 30 16:58:29 oldie kernel: [ 2553.436071] rtw_set_ps_mode(): Busy Traffic , Leave 802.11 power save..
Mar 30 16:58:29 oldie kernel: [ 2553.436182] rtl8192c_set_FwPwrMode_cmd(): Mode = 0, SmartPS = 0
Mar 30 16:58:32 oldie kernel: [ 2557.332718] rtw_set_ps_mode(): Enter 802.11 power save mode...
Mar 30 16:58:32 oldie kernel: [ 2557.332726] rtl8192c_set_FwPwrMode_cmd(): Mode = 1, SmartPS = 2
Mar 30 16:58:50 oldie kernel: [ 2575.005351] rtw_set_ps_mode(): Busy Traffic , Leave 802.11 power save..
Mar 30 16:58:50 oldie kernel: [ 2575.005473] rtl8192c_set_FwPwrMode_cmd(): Mode = 0, SmartPS = 0
Mar 30 16:58:53 oldie kernel: [ 2577.449566] issue_nulldata(wlan0) to b0:c4:e7:2a:01:d9, ch:6, 3/3 in 1056 ms
Mar 30 16:58:53 oldie kernel: [ 2577.449574] survey done event(15) band:0 for wlan0
Mar 30 16:58:54 oldie kernel: [ 2579.376663] rtw_set_ps_mode(): Enter 802.11 power save mode...
Mar 30 16:58:54 oldie kernel: [ 2579.376672] rtl8192c_set_FwPwrMode_cmd(): Mode = 1, SmartPS = 2
Mar 30 16:58:54 oldie kernel: [ 2579.409536] OnAction_back
Mar 30 16:58:54 oldie kernel: [ 2579.409556] OnAction_back, action=2
Mar 30 16:58:54 oldie kernel: [ 2579.409560] OnAction_back(): DELBA: 0(0)
Mar 30 16:58:54 oldie kernel: [ 2579.413849] Drop duplicate management frame with seq_num = 825.
Mar 30 16:58:54 oldie kernel: [ 2579.413868] Drop duplicate management frame with seq_num = 825.

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https://bugs.launchpad.net/bugs/1298802

Title:
  2357:0100 USB Wifi TP-Link WN8200ND cannot associate to access points

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The Usb Wifi dongle TP-Link WN8200ND (rtl8192cu driver) does not
  connect with a default 14.04 trusty updated one or two days ago from
  the internet.

  If I add the dkms module that replaces the builtin driver (see
  instructions and source code in [1]) then I can connect to some access
  points (like my cellphone tethering access point) but not to other
  access points where my laptop connects without any problems.

  [1] https://github.com/pvaret/rtl8192cu-fixes
  ---
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ps         1652 F.... pulseaudio
   /dev/snd/controlC2:  ps         1652 F.... pulseaudio
   /dev/snd/controlC0:  ps         1652 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=503046a7-aabc-47e4-8821-4d73a4a06de1
  InstallationDate: Installed on 2014-03-23 (5 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140321)
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. 965P-DS3
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-19-generic root=UUID=7f56cb3c-a7fe-4445-85d6-321baab07d41 ro quiet splash nomodeset vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-19-generic N/A
   linux-backports-modules-3.13.0-19-generic  N/A
   linux-firmware                             1.126
  RfKill:

  Tags:  trusty
  Uname: Linux 3.13.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 01/12/2007
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F10
  dmi.board.name: 965P-DS3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF10:bd01/12/2007:svnGigabyteTechnologyCo.,Ltd.:pn965P-DS3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rn965P-DS3:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: 965P-DS3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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