Same issue here on hibernation with Feisty on a Vaio VGN-S2XP, but I've
found a workaround that seems to work. First I've changed
HIBERNATE_MODE=shutdown (/etc/default/acpi-support) to
HIBERNATE_MODE=platform (this value reduced energy drain while the
system is hibernated). To completely solve the problem I had to
deactivate WiFi and Bluetooth before hibernating using the hardware
switch that controls both.

I've noticed that Usb is still powered when the system is hibernated,
and the internal Bluetooth is attached to the Usb bus. Moreover during
hibernation process I have to remove modules usbhid uhci_hcd ehci_hcd
(using "MODULES=" in /etc/default/acpi-support) in order to avoid some
error messages about Usb.

I've tried video=radeonfb:force_sleep in /boot/grub/menu.lst and
radeonfb force_sleep=1 in /etc/modules with no success.

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Toshiba laptop battery is drained while shut down
https://bugs.launchpad.net/bugs/110784
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