I have seen the problem in Gutsy, and two things are broken:
/etc/acpi/suspend.d/55-down-interfaces.sh:
When it tries to ifdown interfaces that are brought up not through ifup/ifdown, 
it turns into a 'suspend failure".

/etc/acpi/resume.d/72-acpi-pain.sh:
It tries to unload/load acpi_sbs.  No such module exists.  The correct name is 
"sbs".

I fixed the 72-acpi-pain.sh script on my system, and 55-down-interfaces
I hacked on a workaround tied to my setup, and that makes the Gutsy
problem go away.

BTW, the ultimate debug step for me was:
dbus-send --system --print-reply --dest=org.freedesktop.Hal 
/org/freedesktop/Hal/devices/computer 
org.freedesktop.Hal.Device.SystemPowerManagement.Suspend int32:0

-- 
Feisty reports suspend failed after resuming from suspend
https://bugs.launchpad.net/bugs/89983
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