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[Eduardo Mucelli Rezende Oliveira <edumucelli@xxxxxxxxx>]

Comment # 37 fixed for me

$ sudo rmmod iwlagn
$ sudo rmmod iwlcore
$ sudo modprobe iwlcore
$ sudo modprobe iwlagn

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https://bugs.launchpad.net/bugs/132042

Title:
  wireless stops working until reboot

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Hi 
  I have a Toshiba Satellite P100 laptop. Ever since upgrading to Feisty (clean install), my wireless connection seems to die occassionally and randomly. Network manager can see my wireless AP but just can't connect to it. Once I reboot it works fine. Most often occurs if the laptop is left running for a long time (i.e. a day or more). 

  Kernel:  2.6.20-16-generic
  Using the restricted drivers for the networking which is installed automatically after you install. 

  Tried doing "sudo /etc/init.d/networking restart" but that doesn't
  bring it back.

  Cheers
  Rax

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