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[Bug 1171708] Re: 10ec:8176 Unreliable wireless connectivity with Realtek 8188ce


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  10ec:8176 Unreliable wireless connectivity with Realtek 8188ce

Status in “linux” package in Ubuntu:

Bug description:
  I have an Lenovo X220 Laptop. It has the following wireless card (as
  shown by lshw)

                  description: Wireless interface
                  product: RTL8188CE 802.11b/g/n WiFi Adapter
                  vendor: Realtek Semiconductor Co., Ltd.
                  physical id: 0
                  bus info: pci@0000:03:00.0
                  logical name: wlan0
                  version: 01
                  serial: ec:55:f9:c0:a1:e5
                  width: 64 bits
                  clock: 33MHz
                  capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                  configuration: broadcast=yes driver=rtl8192ce driverversion=3.2.0-38-generic firmware=N/A ip= latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
                  resources: irq:17 ioport:5000(size=256) memory:d2400000-d2403fff

  I am running kernel 3.2.0-38-generic.

  Recently (in the last week or two) I noticed long dropouts in my internet connectivity. At first I assumed the unreliability was due to my ISP. We often have problems during seasons changing but then I noticed the following details, times are estimated:
  1) I would have fairly random dropouts several times (5-20) an hour. Each would last somewhere around 1-4 minutes.
  2) The network manager still showed strong signal (3-4 "bars")
  3) My other devices (iPod, other computers, etc) in the house were able to use the internet fine during these times.
  4) I found my laptop unable to ping my network gateway, a router in my house.

  These lead me to suspect the problem was with my laptop as nothing else was having troubles.  The logs showed no messages that appeared to relevant. In the end I downloaded the latest driver. Support for the "rt8188ce" is provided by the rt8192ce driver from realtek's website

  The version I downloaded was 0012.0207.2013
  Here is a direct link to the driver package. I know it looks sketchy but it is what "US2" points to.

  I compiled and installed it with the following commands

  make install

  and my networking has not shown dropouts over the last 12 hours, a
  vast improvement.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-38-generic 3.2.0-38.61 [modified: lib/modules/3.2.0-38-generic/kernel/drivers/net/wireless/rtlwifi/rtl8192ce/rtl8192ce.ko lib/modules/3.2.0-38-generic/kernel/drivers/net/wireless/rtlwifi/rtl8192de/rtl8192de.ko lib/modules/3.2.0-38-generic/kernel/drivers/net/wireless/rtlwifi/rtl8192se/rtl8192se.ko lib/modules/3.2.0-38-generic/kernel/drivers/net/wireless/rtlwifi/rtlwifi.ko]
  ProcVersionSignature: Ubuntu 3.2.0-38.61-generic 3.2.37
  Uname: Linux 3.2.0-38-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.2
  Architecture: amd64
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   /dev/snd/controlC0:  tim        2170 F.... pulseaudio
   country EC:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 20), (3, 17)
   	(5250 - 5330 @ 20), (3, 23), DFS
   	(5735 - 5835 @ 20), (3, 30)
   Card hw:0 'PCH'/'HDA Intel PCH at 0xd2520000 irq 46'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:14f1506e,17aa21da,00100000 HDA:80862805,80860101,00100000'
     Controls      : 27
     Simple ctrls  : 9
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
     Mixer name	: 'ThinkPad EC (unknown)'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Tue Apr 23 01:24:41 2013
  HibernationDevice: RESUME=UUID=ebd0934b-1b74-48c7-b0eb-53871de2b014
  MachineType: LENOVO 4286CTO
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-38-generic root=/dev/mapper/VG00-root ro quiet splash pcie_aspm=force vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-3.2.0-38-generic N/A
   linux-backports-modules-3.2.0-38-generic  N/A
   linux-firmware                            1.79.1
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: Upgraded to precise on 2012-05-24 (333 days ago)
  dmi.bios.date: 04/01/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET42WW (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4286CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET42WW(1.12):bd04/01/2011:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4286CTO
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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