Activating acpi on a thinkpad R51

[vittorio]

I wonder what steps should I take using the battery to make my thinkpad R51 go 
to stand-by or suspend (by the way, what's the difference between suspend & 
stand-by?) when I close the lid and what should I do  to resume the suspended  
session? 

Issuing "sysctl -a|grep acpi" I get the following:

      acpidev    74     3K       -       74  32
      acpisem    22     2K       -       22  64
     acpitask     0     0K       -       86  32
       acpica  3606   184K       -    26157  16,32,64,128,256,512,1024,2048
    acpi_perf     1     1K       -        1  256
debug.acpi.do_powerstate: 1
debug.acpi.acpi_ca_version: 0x20041119
debug.acpi.semaphore_debug: 0
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: S1
hw.acpi.suspend_state: S3
hw.acpi.sleep_delay: 1
hw.acpi.s4bios: 0
hw.acpi.verbose: 0
hw.acpi.reset_video: 1
hw.acpi.cpu.cx_supported: C1/1 C2/1 C3/85 C4/185
hw.acpi.cpu.cx_lowest: C1
hw.acpi.cpu.cx_usage: 100.00% 0.00% 0.00% 0.00%
hw.acpi.thermal.min_runtime: 0
hw.acpi.thermal.polling_rate: 10
hw.acpi.thermal.tz0.temperature: 46.0C
hw.acpi.thermal.tz0.active: -1
hw.acpi.thermal.tz0.thermal_flags: 0
hw.acpi.thermal.tz0._PSV: 86.5C
hw.acpi.thermal.tz0._HOT: -1
hw.acpi.thermal.tz0._CRT: 94.0C
hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
hw.acpi.battery.life: 89
hw.acpi.battery.time: 142
hw.acpi.battery.state: 1
hw.acpi.battery.units: 1
hw.acpi.battery.info_expire: 5
hw.acpi.acline: 0
machdep.acpi_timer_freq: 3579545
machdep.acpi_root: 1011120
dev.acpi.0.%desc: IBM TP-1V
dev.acpi.0.%driver: acpi
dev.acpi.0.%parent: nexus0
dev.acpi_ec.0.%desc: Embedded Controller: GPE 0x1c, ECDT
dev.acpi_ec.0.%driver: acpi_ec
dev.acpi_ec.0.%location: handle=\_SB_.PCI0.LPC_.EC__
dev.acpi_ec.0.%pnpinfo: _HID=PNP0C09 _UID=0
dev.acpi_ec.0.%parent: acpi0
dev.pci_link.0.%parent: acpi0
dev.pci_link.1.%parent: acpi0
dev.pci_link.2.%parent: acpi0
dev.pci_link.3.%parent: acpi0
dev.pci_link.4.%parent: acpi0
dev.pci_link.5.%parent: acpi0
dev.pci_link.6.%parent: acpi0
dev.pci_link.7.%parent: acpi0
dev.acpi_sysresource.0.%desc: System Resource
dev.acpi_sysresource.0.%driver: acpi_sysresource
dev.acpi_sysresource.0.%location: handle=\_SB_.MEM_
dev.acpi_sysresource.0.%pnpinfo: _HID=PNP0C01 _UID=0
dev.acpi_sysresource.0.%parent: acpi0
dev.acpi_sysresource.1.%desc: System Resource
dev.acpi_sysresource.1.%driver: acpi_sysresource
dev.acpi_sysresource.1.%location: handle=\_SB_.PCI0.LPC_.SIO_
dev.acpi_sysresource.1.%pnpinfo: _HID=PNP0C02 _UID=0
dev.acpi_sysresource.1.%parent: acpi0
dev.acpi_timer.0.%desc: 24-bit timer at 3.579545MHz
dev.acpi_timer.0.%driver: acpi_timer
dev.acpi_timer.0.%location: unknown
dev.acpi_timer.0.%pnpinfo: unknown
dev.acpi_timer.0.%parent: acpi0
dev.cpu.0.%parent: acpi0
dev.acpi_perf.0.%desc: ACPI CPU Frequency Control
dev.acpi_perf.0.%driver: acpi_perf
dev.acpi_perf.0.%parent: cpu0
dev.acpi_perf.0.freq_settings: 1600/21000 1400/18500 1200/15500 1000/13000 
800/10000 600/7500
dev.acpi_throttle.0.%desc: ACPI CPU Throttling
dev.acpi_throttle.0.%driver: acpi_throttle
dev.acpi_throttle.0.%parent: cpu0
dev.acpi_throttle.0.freq_settings: 10000/-1 8750/-1 7500/-1 6250/-1 5000/-1 
3750/-1 2500/-1 1250/-1
dev.acpi_lid.0.%desc: Control Method Lid Switch
dev.acpi_lid.0.%driver: acpi_lid
dev.acpi_lid.0.%location: handle=\_SB_.LID_
dev.acpi_lid.0.%pnpinfo: _HID=PNP0C0D _UID=0
dev.acpi_lid.0.%parent: acpi0
dev.acpi_lid.0.wake: 1
dev.acpi_button.0.%desc: Sleep Button
dev.acpi_button.0.%driver: acpi_button
dev.acpi_button.0.%location: handle=\_SB_.SLPB
dev.acpi_button.0.%pnpinfo: _HID=PNP0C0E _UID=0
dev.acpi_button.0.%parent: acpi0
dev.acpi_button.0.wake: 1
dev.pcib.0.%parent: acpi0
dev.acpi_tz.0.%desc: Thermal Zone
dev.acpi_tz.0.%driver: acpi_tz
dev.acpi_tz.0.%location: handle=\_TZ_.THM0
dev.acpi_tz.0.%pnpinfo: _HID=none _UID=0
dev.acpi_tz.0.%parent: acpi0
dev.atpic.0.%parent: acpi0
dev.attimer.0.%parent: acpi0
dev.attimer.1.%parent: acpi0
dev.atdma.0.%parent: acpi0
dev.npxisa.0.%parent: acpi0
dev.atkbdc.0.%parent: acpi0
dev.psmcpnp.0.%parent: acpi0
dev.sio.0.%parent: acpi0
dev.sio.1.%parent: acpi0
dev.ppc.0.%parent: acpi0
dev.battery.0.%parent: acpi0
dev.acpi_acad.0.%desc: AC Adapter
dev.acpi_acad.0.%driver: acpi_acad
dev.acpi_acad.0.%location: handle=\_SB_.PCI0.LPC_.EC__.AC__
dev.acpi_acad.0.%pnpinfo: _HID=ACPI0003 _UID=0
dev.acpi_acad.0.%parent: acpi0

Ciao
Vittorio