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My wifi goes in and out on Ubuntu; I do not have this issue in OSX Yosemite (dual-boot). There is no message saying that it disconnected from the router. Sometimes it will just hang and other times it will say it cannot find the page or I am not connected to the internet in chrome (this takes 10-30 seconds when it happens, and happens every 5-10 minutes). After this it loads the page fine. Here is my wifi info (pastebin link below), any help is greatly appreciated.

wifi: http://pastebin.com/RyFuXNFR

lsmod: http://pastebin.com/jemU7fGt

Thanks in advance for any help!

edit: updated pastebin link after making changes suggested by chili555 edit: updated pastebin again to reflect recent changes - also added lsmod pastebin

CitizenKern
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4 Answers4

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Have you tried changing wifi channel on your router? I admit if the OSX system is stable & the Ubuntu one is not, then it's less likely to be a channel interference problem. But I recently had similar symptoms where my wifi started to drop out/recover/drop out/etc. This was after it had been stable for years. Changing the wifi channel fixed the issue for me. Channels 1, 6, 11 are apparently the best to try.

paj987
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This: Installing Broadcom Wireless Drivers suggests that you have the incorrect driver for your device. Please get a temporary internet connection by whatever means, open a terminal and do:

sudo apt-get purge bcmwl-kernel-source
sudo apt-get install firmware-b43-installer

Reboot and your wireless should be working as expected.

I notice this in your wireless_script:

Channel occupancy:

  1   APs on   Frequency:2.417 GHz (Channel 2)
  1   APs on   Frequency:2.432 GHz (Channel 5)
  20   APs on   Frequency:2.437 GHz (Channel 6)
  4   APs on   Frequency:2.442 GHz (Channel 7)
  1   APs on   Frequency:2.452 GHz (Channel 9)
  5   APs on   Frequency:2.462 GHz (Channel 11)

Your access point is one of the 20 (!!) on channel 6. I suggest you change the router to channel 1 to avoid the interference.

Community
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chili555
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Try to disable the wifi power manager and see if it helps, it did for me.

sudo iwconfig wlan0 power off

Check to see if it's off or on

iwconfig
Chanito
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Search for rfkill in /var/log/syslog

My RealTek Wi-Fi uses power saving which gets misinterpreted by rfkill as hard blocks, causing NetworkManager to shut it down until it comes out of low power mode, then NetworkManager re-initializes Wi-Fi, which takes appreciable time.

I detected this only because the RealTek driver logs power changes, which could be correlated with rfkill change messages. Wi-Fi works fine when

1) stop network-manager

2) manually start wlan0 using wpa_supplicant and dhclient

or after NetworkManager is completely removed and replaced by Wicd, which ignores rfkill.

blekenbleu
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