On my sony vaio vpcw11s1e, I can confirm this bug. unplugging the power cord in 
gnome makes the system go to standby. I just bought the computer and put Ubuntu 
9.10 on it (fresh standard install of the final version):
kirs...@vaio:~$ cat /proc/version
Linux version 2.6.31-14-generic (bui...@rothera) (gcc version 4.4.1 (Ubuntu 
4.4.1-4ubuntu8) ) #48-Ubuntu SMP Fri Oct 16 14:04:26 UTC 2009

the acpi event it receives on unplugging is:
processor CPU0 00000081 00000000
processor CPU1 00000081 00000000
battery BAT1 00000080 00000001

This is probably connected to an issue with the gnome-power-manager or
pm-utils, since it doesn't happen in gnome-safe mode or when I use
another WM such as fluxbox.

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When i remove the AC power cable from my laptop, the computer goes to sleep.
https://bugs.launchpad.net/bugs/427629
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