The acpi=off option also doesn't seem to help in my case -Dell 1340 studio XPS
13 again.
nomodeset and nouveau.blacklist=1.Also seems to be useless.
Suppose it is something to do with the Nvidia hybrid SLI graphics card.
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Bu
i have the sam problem for hibernate/suspend too
i too use compiz and an nvidia onboard card
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Hibernate will not poweroff laptop at very "last" step
https://bugs.launchpad.net/bugs/73805
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