Possible workaround for buggy S5

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A user has reported in debian bug #694926 that their laptop battery discharges rapidly when they shutdown, unless they disable hwclock
- --systohc in the shutdown scripts. I am not sure why that triggers it, but I can only assume that their acpi firmware is buggy and remaining in standby to allow for wakeups.

Is there a way to bypass the acpi firmware S5 transition and force the system to truly power off as a workaround?

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No idea about this. Long time ago, François Boisson reported a similar issue on kernel bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=47811

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