I am having a similar problem with 9.10 (clean install) on Dell 700m laptop. 
Power management worked great with 8.10 but with 9.10 whenever I unplug the 
laptop power adapter, the machine goes into sleep or hibernate (whichever I 
have set in the power options). This happens regardless of the state of charge 
of the battery and it happens on both plugging and unplugging the power 
adapter.  The battery is fine and runs for 5 hours.
The first message in dmesg after the unplug is:
[ 287.600663] b44: eth0: powering down PHY
This seems to be initiating the sleep or hibernate action.
I had 8.10 installed on this machine before and never had a problem like this. 
Power management worked perfectly with sleep and hibernate and I could plug and 
unplug the power adapter without causing a sleep or hibernate event.
Steve Langasek wrote on 2009-12-24:     #6

Please include in your report the output of the 'acpi_listen' command
left running across a suspend/resume cycle.

m...@mark-laptop:~$ acpi_listen
( power adapter unplugged here)
ac_adapter ADP1 00000080 00000000
battery BAT0 00000080 00000001
battery BAT0 00000081 00000001
battery BAT0 00000081 00000001
 (goes into suspend)

(plug in power adapter)
ac_adapter ADP1 00000080 00000000
battery BAT0 00000080 00000001
battery BAT0 00000081 00000001

-- 
Lap hibernates when disconnected from AC power (and no, it's not a battery 
issue)
https://bugs.launchpad.net/bugs/499170
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