Wifi (wlan) slow and unstable when updated to 14.04

[Henrique Gogó]

Since I updated ubuntu to 14.04 version, my wifi is unstable and slow. I did wifi tests and sometimes the connection stabilze but in some minutes (sometimes 30minutes, or 8minutes, or more, or less) the wifi network disconnects. I need to turn the wireless adapter off and on again to reconnect.

When I tested my wifi speed (in some websites that measure this), I see that the download proccess is very unstable. Sometimes go to the maximum speed and after stops, and go slow, and go fast... very unstable!

I dont know if this is a network problem or kernel problem, but I can confirm that this just happens on new ubuntu version (14.04) - I have other notebook with other distro and works fine, and my Android device has a stable wifi connection.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.2
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue Apr 22 01:14:46 2014
InstallationDate: Installed on 2013-10-31 (173 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to trusty on 2014-04-19 (2 days ago)
VarLogDistupgradeTermlog:

[Wydarr (wydarr-s)]

Can it be a duplicate of this?

https://bugs.launchpad.net/ubuntu/+bug/1309385

[sniegu84 (sniegu84)]

Upgraded ubuntu from 12.04 to 14.04. My wifi is unstable on kernel 3.13.0.24 generic. Switched back to precise's 3.8.0.38 generic until fix is available. Issue is not observed. On 3.13* wifi although doesn't disconnect but internet disconnects every couple of minutes.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.