I have this problem with Karmic and the problem is reproducible. First
suspend and resume works, second suspend results in services stopping
but the computer not entering sleep. The only option is to kill the
power.

By Nemtudom's suggestion, I tried executing "sync" before suspend and
found that sync works before the first suspend, but hangs before the
second suspend.

In addition, my kernel log shows numerous messages saying: 
  INFO: task sync:##### blocked for more than 120 seconds
This message appears regardless of whether I manually run sync or not. 

Please help!

Thanks

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suspend/resume failure during second suspend [non-free: nvidia]
https://bugs.launchpad.net/bugs/350477
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