kernel-packages team mailing list archive

[Florian Echtler <1365844@xxxxxxxxxxxxxxxxxx>]

For the record, this still is a problem on 14.04 with HWE kernel
(currently linux-image-generic-lts-vivid-3.19.0.26.13). Bad throughput
and massive packet loss with built-in driver, no issues anymore with
out-of-tree driver.

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

Title:
  0bda:8178 buggy driver rtl8192cu

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 14.04/14.10 driver rtl8192cu for a Realtek USB wireless card is
  buggy. I can connect to wifi, but soon the connection is dropped.

  WORKAROUND: 1. First check whether the buggy driver rtl8192cu is active in your operating system. Execute at a terminal window:
  lsmod | grep rtl

  2. Disconnect your wireless connection (unplug the USB adapter that
  contains the Realtek chipset), and temporarily connect to the internet
  by means of an ethernet cable (or by means of another wireless chipset
  that does function well).

  3. Now install some applications for building the right driver via a terminal:
  sudo apt-get install linux-headers-generic build-essential dkms git

  4. Now download the source code of the driver via a terminal:
  git clone https://github.com/pvaret/rtl8192cu-fixes.git

  5. Set it up as a DKMS module via a terminal:
  sudo dkms add ./rtl8192cu-fixes

  6. Build and install the new driver via a terminal:
  sudo dkms install 8192cu/1.9

  7. Refresh the module list via a terminal:
  sudo depmod -a

  8. Blacklist the faulty driver via a terminal:
  sudo cp ./rtl8192cu-fixes/blacklist-native-rtl8192.conf /etc/modprobe.d/

  9. Reboot your computer. The problem should now be solved: disconnect the temporary ethernet cable and insert the Realtek device again. With the following terminal command you can check whether the right driver is active now (copy and paste it into the terminal):
  lsmod | grep 8192

  Note: a possibly surprising side effect might be, that the light on
  your wireless card is blinking constantly now. That's normal: the
  light is blinking whenever data are being sent or received.

  Source: https://github.com/pvaret/rtl8192cu-fixes

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-headers-3.13.0-24 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bob        1852 F.... pulseaudio
   /dev/snd/controlC1:  bob        1852 F.... pulseaudio
  CurrentDesktop: LXDE
  Date: Fri Sep  5 14:02:05 2014
  HibernationDevice: RESUME=UUID=6d790ec4-ec3d-43a7-ab1a-c4b574e60673
  InstallationDate: Installed on 2014-05-20 (107 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: ASUS All Series
  PackageArchitecture: all
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=37f58aeb-6419-4ca6-a667-002bb0791572 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.5
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/07/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0803
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H81I-PLUS
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0803:bd01/07/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH81I-PLUS:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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