Public bug reported:

wifi card : Atheros 9285. laptop sony vaio VPCYA15FG. Problem : unstable 
working/breaking wifi card. In ubuntu 12.4, sometimes it works, but usually the 
system sees the wifi card and says that it is unavailable. I can not  turn on 
wifi card from systemsettings/network. Around the internet i found instruction 
: include the text "blacklist acer-wmi" to the end of the file 
"/etc/modprobe.d/blacklist.conf" . I did this instruction, and the system work 
wells with the wifi card. But sometimes thi above problem repeats again. I do 
not know how to fix. And at this time I temporarylly solve this problem by the 
following unconvennient method :  if problem occurs then i delete the line 
"blacklist acer-wmi" from file blacklist.conf, restart laptob, then again add 
text "blacklist acer-wmi" to file blacklist.conf, then restart again. This 
method works, but for me it is very unconvennient.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1028764

Title:
  atheros 9285 wireless card problem

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