Ian Smith wrote:
As Paul said, hibernation only works if the machine's BIOS supports it (hw.acpi.s4bios = 1) AND you've already prepared a suitable disk area, usually a separate slice (DOS partition) or as a file in a 'doze slice.

To make even a vaguely informed guess as to whether hibernation and/or acpiconf -s3 (suspend/resume) might work, we'd need to know:

 What version of FreeBSD on which architecture?  (output of 'uname -a')

 What make and model of laptop?  (someone may know if that one works)

 Whether it runs a single or multiple CPUs?  (see /var/run/dmesg.boot)

 The output of 'sysctl hw.acpi' ?

cheers, Ian

Here is this information:
Laptop is Lenovo S10-2, single CPU, Intel Atom.

--- sysctl hw.acpi output ---

hw.acpi.supported_sleep_state: S3 S4 S5
hw.acpi.power_button_state: S5
hw.acpi.sleep_button_state: S3
hw.acpi.lid_switch_state: NONE
hw.acpi.standby_state: NONE
hw.acpi.suspend_state: S3
hw.acpi.sleep_delay: 1
hw.acpi.s4bios: 0
hw.acpi.verbose: 0
hw.acpi.disable_on_reboot: 0
hw.acpi.handle_reboot: 0
hw.acpi.reset_video: 0
hw.acpi.thermal.min_runtime: 0
hw.acpi.thermal.polling_rate: 10
hw.acpi.thermal.user_override: 0
hw.acpi.thermal.tz0.temperature: 43.0C
hw.acpi.thermal.tz0.active: -1
hw.acpi.thermal.tz0.passive_cooling: 0
hw.acpi.thermal.tz0.thermal_flags: 0
hw.acpi.thermal.tz0._PSV: -1
hw.acpi.thermal.tz0._HOT: -1
hw.acpi.thermal.tz0._CRT: 102.0C
hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
hw.acpi.thermal.tz0._TC1: -1
hw.acpi.thermal.tz0._TC2: -1
hw.acpi.thermal.tz0._TSP: 300
hw.acpi.battery.life: -1
hw.acpi.battery.time: -1
hw.acpi.battery.state: 7
hw.acpi.battery.units: 1
hw.acpi.battery.info_expire: 5
hw.acpi.acline: 1
hw.acpi.cpu.cx_lowest: C1

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