disabling sleep when shutting down

[Jung-uk Kim]

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On 09/16/2015 23:49, Colin Percival wrote:
> Hi ACPI people,
> 
> I ran into an interesting glitch recently: I told my laptop to shut
> down, then closed the lid... and it promptly went into S3.  When I
> opened the lid a couple days later, it resumed... and then finished
> the shutdown which it had started 2 days earlier.  Meanwhile with
> two days of sitting in S3 instead of S5, the battery had almost
> completely drained.
> 
> The obvious answer here is to disable Suspend if we're in the
> shutdown path.  My first thought was to make rc.suspend slightly
> smarter, but that isn't good enough since there's a 10 second
> timeout after which the suspend will happen even if rc.suspend
> doesn't send the expected acknowledgment.  So I think we need to
> get the kernel ACPI bits to disable Suspend.
> 
> It looks to me like adding a sysctl to dev/acpica/acpi.c and
> checking it in acpi_ReqSleepState would work; then we just need a
> line in /etc/rc.shutdown to set the sysctl.  But ACPI code scares
> me, so I figured I should check with you guys first... am I missing
> anything?

Please try the attached patch.

Jung-uk Kim
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