There's a lot of useful history and workarounds for this bug in 2 previous bugs:
https://bugs.launchpad.net/ubuntu/+source/linux-restricted-modules/+bug/272300/
https://bugs.launchpad.net/ubuntu/+source/linux-restricted-modules/+bug/275692
I'm using Ubuntu 8.10 Intrepid on a Thinkpad T400 (Atheros chipset)
using madwifi - haven't otherwise messed with the default networking
setup.
madwifi works flawlessly except for this suspend issue. Specifically,
resuming from suspend results in a message saying I'm not connected.
Checking the list of networks shows no wifi APs available. Eventually
I'm prompted for a password, which is already correctly entered. Leaving
it be and click OK or reentering it and click OK both cause it to fail.
Brian's workaround fixes the glitch for me:
In /usr/lib/pm-utils/sleep.d/10NetworkManager
hibernate|suspend)
suspend_nm
;;
thaw|resume)
ifconfig wifi0 up <-----
resume_nm
Add the line with the arrow pointing at it.
Without having this workaround in place, I can instead work around this
issue by running the following 3 commands at a Terminal:
sudo madwifi-unload
sudo /sbin/modprobe ath_pci
sudo ifconfig wifi0 up
--
Atheros Wi-Fi card does not always work after suspend
https://bugs.launchpad.net/bugs/341627
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