This sounds an awful lot like bug 6289.
If you edit /etc/acpi/hibernate.sh and add
set -x
just under the #!/bin/sh line, then from a shell do
sudo /etc/acpi/hibernate.sh
what happens?
** Changed in: gnome-power-manager (Ubuntu)
Sourcepackagename: gnome-power-manager => acpi-support
Assignee: (unassigned) => Simon Law
Status: Unconfirmed => Needs Info
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hibernate does not work properly for Dell Inspiron 1150
https://launchpad.net/bugs/59455
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