Public bug reported:
Shortly after upgrading to the recent kernel 3.2.0-36-generic I started
to notice that my wireless connection got seriously jammed:
- Using TP-Link PCI Wireless-Card with Atheros AR5212/AR5213 chip.
- Anything over the web (SSH, HTTP(S)) appears to be a bit slow.
- Pinging my access point produces a rather high packet loss rate (30-50%).
- Quite commonly the ping says "destination host unreachable".
- Dis- and reconnecting to the AP (WPA2-PSK) is working well, but ping is still
complaining about "destination host unreachable".
- Other machines (laptops and smartphones) show no such behavior.
- syslog, dmesg and iw show no suspicious messages.
- Unrelated -- but very confusing -- Wireshark tells me that -- among some
erroneous or lost packets -- my machine is constantly sending LLC, BACnet-APDU
and X.25 protocol packets to the MAC address belonging to the laptop of my wife.
I have downgraded to kernel 3.2.0.35-generic. This kernel can maintain a
stable connection (ping loss rate of 6%) but is also sending lots of
said LLC packets. Thus I would conclude that the problem is within the
kernel or wifi driver ath5k and that it is no hardware problem.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-36-generic 3.2.0-36.57
ProcVersionSignature: Ubuntu 3.2.0-36.57-generic 3.2.35
Uname: Linux 3.2.0-36-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: andi 2493 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'SB'/'HDA ATI SB at 0xf9ff4000 irq 16'
Mixer name : 'Analog Devices AD1988B'
Components : 'HDA:11d4198b,1043829b,00100400'
Controls : 47
Simple ctrls : 27
Date: Thu Jan 31 17:31:31 2013
HibernationDevice: RESUME=UUID=bda285a0-b5fe-416c-bee5-7c40b09f6c6c
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
MachineType: System manufacturer System Product Name
MarkForUpload: True
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-36-generic
root=UUID=66bde4a3-d076-4fe9-a163-efa6a2d01733 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-36-generic N/A
linux-backports-modules-3.2.0-36-generic N/A
linux-firmware 1.79.1
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog: Jan 31 17:29:47 nukebox wpa_supplicant[1379]: WPA: Group rekeying
completed with 94:0c:6d:b2:7e:22 [GTK=TKIP]
dmi.bios.date: 12/26/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0801
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M3A32-MVP DELUXE
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0801:bd12/26/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM3A32-MVPDELUXE:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug ar5212 ar5213 ath5k precise
** Attachment added: "Excerpt from wireshark output: 48 LLC packets"
https://bugs.launchpad.net/bugs/1111603/+attachment/3509146/+files/wireshark
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https://bugs.launchpad.net/bugs/1111603
Title:
Wireless connection via AR5212/AR5213 shows bad performance
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