Public bug reported:

kernel 2.6.27-3 x64 8.10
mt-3422 laptop using rtl8180 wifi driver
1. boot up connected to LAN leaving wireless device off.
2. after logged in, unplug LAN wire. connection lost. all good.
3. alt+F2 (turns on wireless device) 
network manager does not initialize wifi. no wireless network detected. no 
network discovery. 
4. left click network manager icon. select 'connect to other wireless network' 
then choose "yournetworkname" from dropped down menu, applet shows info 
(however, hex key is not being saved by applet (that's another bug)) connect 
button grayed out. 
expected: wireless connection should have been established with preferred wlan 
after wired LAN was lost.

tried logging off and back in (no LAN and wireless device ON). no
results. then tried restarting the computer with no LAN and wireless
device ON. success.   (however, i also noticed the verbose shutdown
stated wlan0 was being deactivated, even thought it acted as if it was
off the whole time)

** Affects: ubuntu
     Importance: Undecided
         Status: New

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wireless lan does not automatically start when wired connection is dropped
https://bugs.launchpad.net/bugs/270596
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