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0e1f616
(Get the code!)
The sleeping process seems to work fine, the problem arises resuming the machine. Latter process seems never to be completed and stops right after the LCD back-light is turned on (but the screen remains black). At that point, the keyboard seems not to work, for example nothing happens pressing Caps-Lock.
If I resume after a suspend from VT1, the screen is restored but the keyboard still doesn't work, moreover the following message is displayed every 60 - 70 seconds:
BUG: soft lockup - CPU#0 stuck for 61s! [NetworkManager: 3483]
I use kubuntu since 6.10, in the past, on my machine, Suspend/Resume has worked only with Kubuntu 8.04, if I remember fine. If that information is important for you, I can try to test it with a liveCD.