I had the same problem on Ubuntu 12.04, maybe a problem in the kernel. For no reason my wifi connection slowed down. I had less than 1B/s.
WORKAROUND: sudo rmmod iwlwifi
sudo modprobe iwlwifi 11n_disable=1
and to apply this after reboot I created /etc/modprobe.d/iwlwifi.conf and add in it :
options iwlwifi 11n_disable=1
Like it's told here : http://forum.ubuntu-fr.org/viewtopic.php?id=941711
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu13+elementary3~precise1
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: VT1802 Analog [VT1802 Analog]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: atom 3135 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xf7a10000 irq 50'
Mixer name : 'Intel PantherPoint HDMI'
Components : 'HDA:11068446,15581550,00100000 HDA:80862806,80860101,00100000'
Controls : 49
Simple ctrls : 21
DistroRelease: elementary 0.2
HibernationDevice: RESUME=UUID=3be0eafe-b14a-422c-a86a-0ddf203870ef
InstallationMedia: elementary OS 0.2 "Luna" - Build amd64 LIVE Binary 20120909-14:36
MachineType: CLEVO CO. W150ER
Package: linux (not installed)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=fr_FR.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-30-generic root=UUID=fe60b9c5-8b14-4f74-818a-34e70cf44c12 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27
RelatedPackageVersions:
linux-restricted-modules-3.2.0-30-generic N/A
linux-backports-modules-3.2.0-30-generic N/A
linux-firmware 1.79.1
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
StagingDrivers: mei
Tags: precise staging
Uname: Linux 3.2.0-30-generic x86_64
UnreportableReason: Ce paquet n'est pas officiellement pris en charge par elementary. Veuillez désinstaller tout paquet tiers et réessayer.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 03/14/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: W150ER
dmi.board.vendor: CLEVO CO.
dmi.board.version: N/A
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 9
dmi.chassis.vendor: CLEVO CO.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd03/14/2012:svnCLEVOCO.:pnW150ER:pvrN/A:rvnCLEVOCO.:rnW150ER:rvrN/A:cvnCLEVOCO.:ct9:cvrN/A:
dmi.product.name: W150ER
dmi.product.version: N/A
dmi.sys.vendor: CLEVO CO.
If Ubuntu 12.04 has the same bug, it should be reported to Ubuntu. I've retargeted the bug against Linux package in Ubuntu, assuming it's a driver issue.