Confirming this still affects 12.04 with the same laptop.
I didn't have my old hack script handy, so I put a new one in
/etc/pm/sleep.d with a resume case, that did:
(in bash): for a in {1..10}; do iwlist scan > /dev/null; sleep 1; done
Yeah, this lame hack seems to work perfectly.
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https://bugs.launchpad.net/bugs/665944
Title:
System takes too long to activate wifi on resume
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