In summary, what needs to be done as a workaround for this bug is:

1. Install the kernel from http://kernel.ubuntu.com/~kernel-
ppa/mainline/v2.6.37.6-natty/. I only use 32-bit so haven't tested
64-bit.

2. Add the following lines to /etc/rc.local before the exit 0 line:

modprobe acer_wmi
rmmod -f acer_wmi
rfkill unblock all

3. Reboot into the newly installed kernel.

4. Check the "Enable wireless" box in the NM applet if it is not already
automatically checked.

5. Configure your wireless connection options.

Please also note other comments posted at
http://ubuntuforums.org/showthread.php?t=1787618 (actually the good
stuff is on page 2:
http://ubuntuforums.org/showthread.php?t=1787618&page=2).

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https://bugs.launchpad.net/bugs/780040

Title:
  wifi softblocked atheros ar9285 cannot unblock ideapad z570

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