A look at the kernel sources gives me the following list of drivers that
implement scan_capa:

ipw2200
hostap
mac80211, which is used by:
 - rt2x00usb
 - rt73usb
 - rt2x00pci
 - rt2500pci
 - rt2400pci
 - rt61pci
 - rt2500usb
 - b43
 - p54pci
 - b43legacy
 - p54usb
 - rtl8187
 - adm8211

This means that, as far as I'm able to determine from the kernel, all of
these drivers should be able to connect to hidden SSIDs with Linux
2.6.24-12 and network-manager 0.6.6-0ubuntu3.  Gene, this list seems to
cover your chipset; can you please confirm that you're running the
current versions of these packages, or if not, upgrade and report the
results?

David, ndiswrapper is clearly not in this list, so does not support the
scan_capa functionality; handling this driver will probably require
addition of another quirk in network-manager along with the existing
quirk for atheros drivers.  On the other hand, it's possible that
ndiswrapper does support the necessary interfaces when they're supported
by the underlying wrapped driver, so this could be a regression for some
other ndiswrapper users... on the gripping hand, it looks like it should
only be a performance regression rather than a regression in
functionality.  So we're probably ok to go ahead with a change like your
patch for ndiswrapper; it's probably best if Alexander comments on it
first, though, since he knows this code far better than I do.

-- 
can't connect to hidden network
https://bugs.launchpad.net/bugs/50214
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