Date: Wed, 16 Sep 2015 20:49:28 -0700 From: Colin Percival <cperciva@freebsd.org> To: "freebsd-acpi@freebsd.org" <freebsd-acpi@freebsd.org> Subject: disabling sleep when shutting down Message-ID: <55FA3848.7090802@freebsd.org>
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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? -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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