i have this bug as well on  a Dell XPS M1330 running current 9.10

i have been trying to reproduce this bug consistently for several months
and failing.  just today it happened again -- twice:

1.  suspend laptop via lid close, disconnect power, resume on battery.  laptop 
immediately resuspends.  2nd resume attempt is successful.
2.  suspend laptop via lid close, reconnect power, resume on AC.   laptop 
immediately resuspends.  2nd resume attempt is successful.

maybe it has less to do with the state of the power (AC vs battery) as
it does with a power state *change* while suspended?

-- 
Laptop automatically suspends right after resume if power cable was 
disconnected before resuming
https://bugs.launchpad.net/bugs/492649
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