Public bug reported:
Binary package hint: network-manager
My mother has a Dell laptop with builtin ipw3945 wireless.
Recently she accidentally knocked the hardware wifi kill switch. This
caused the network to stop working, as might be expected. However, what
ought not to be expected is that there was no indication to the user of
what the problem was.
Investigating myself (remotely, via a wired network connection) I found
that the ipw3945 driver did know that the hardware was present and that
the kill switch was engaged:
Oct 22 15:53:50 friesland kernel: [ 1319.704000] Kill switch must be
turned off for wireless networking to work.
However, there was no machinery to bring this to the attention of the
user. The driver simply failed to create the appropriate network
interface. network-manager stopped seeing it. From the point of view
of the higher layers it was as if the hardware had vanished.
Furthermore, after the kill switch was put back to the operational
position, the network didn't start working again. I restarted the
/sbin/ipw3945d-2.6.20-15-generic daemon to no useful effect. I didn't
reload the module by hand; it seems possible that this would have fixed
it. But in any case no further user action should be needed.
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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kill switch induces mystifying failure
https://bugs.launchpad.net/bugs/155867
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