Public bug reported:
Ever since the upgrade to precise my wireless card has delivered wildly
inconsistent speeds. It can fluctuate quite quickly between full normal
speed and practically nothing. There is no interference that I'm aware
of, and it doesn't happen in any other OSes that I'm aware of (Oneiric
or Windows).
Interesting to note is that Network Manager is aware of the fluctuation:
In the "Connection Information" panel the "Speed" field is 54 Mb/s
normally, but fluctuates to 11 Mb/s or so in time with the actual data
rate.
relevant lspci output for the card:
02:00.0 Network controller: Atheros Communications Inc. AR922X Wireless Network
Adapter (rev 01)
Subsystem: D-Link System Inc DWA-552 802.11n Xtreme N Desktop Adapter
(rev A2)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 168, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 21
Region 0: Memory at fdce0000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [44] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=100mA
PME(D0+,D1-,D2-,D3hot+,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME+
Kernel driver in use: ath9k
Kernel modules: ath9k
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-3-generic 3.2.0-3.9
ProcVersionSignature: Ubuntu 3.2.0-3.9-generic 3.2.0-rc4
Uname: Linux 3.2.0-3-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.90-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: eapache 1723 F.... pulseaudio
/dev/snd/controlC0: eapache 1723 F.... pulseaudio
/dev/snd/controlC1: eapache 1723 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfdff4000 irq 42'
Mixer name : 'Realtek ALC888'
Components : 'HDA:10ec0888,1028020d,00100001'
Controls : 40
Simple ctrls : 22
Card1.Amixer.info:
Card hw:1 'U0x46d0x9a2'/'USB Device 0x46d:0x9a2 at usb-0000:00:1a.7-6, high
speed'
Mixer name : 'USB Mixer'
Components : 'USB046d:09a2'
Controls : 2
Simple ctrls : 1
Card1.Amixer.values:
Simple mixer control 'Mic',0
Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
Capture channels: Mono
Limits: Capture 0 - 3072
Mono: Capture 1536 [50%] [24.00dB] [on]
Card2.Amixer.info:
Card hw:2 'HDMI'/'HDA ATI HDMI at 0xfddfc000 irq 43'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100000'
Controls : 5
Simple ctrls : 1
Card2.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
CheckboxSubmission: e049aa43e015d38fc2b288a8a60db142
CheckboxSystem: 2a6f54df59af338184485e85cbcf0d32
Date: Fri Dec 9 22:09:55 2011
HibernationDevice: RESUME=UUID=7a19d99e-7113-4cca-ab69-0e3d7de02716
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2)
MachineType: Dell Inc. Inspiron 530
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-3-generic
root=UUID=60269649-642d-4672-83bb-7bfadaae6e31 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-3-generic N/A
linux-backports-modules-3.2.0-3-generic N/A
linux-firmware 1.62
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to precise on 2011-11-26 (13 days ago)
dmi.bios.date: 06/20/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.0.15
dmi.board.name: 0FM586
dmi.board.vendor: Dell Inc.
dmi.board.version: ���
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: OEM
dmi.modalias:
dmi:bvnDellInc.:bvr1.0.15:bd06/20/2008:svnDellInc.:pnInspiron530:pvr:rvnDellInc.:rn0FM586:rvr:cvnDellInc.:ct3:cvrOEM:
dmi.product.name: Inspiron 530
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise regression-release running-unity
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https://bugs.launchpad.net/bugs/902420
Title:
AR922X Wireless flaky since upgrade to Precise
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