Follow by step in 
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html
#sysctl debug.bootverbose=1
#sysctl debug.acpi.suspend_bounce=1
#acpiconf -s 3    (or push Fn+F3)

After a moment, the display is light and black, LED Sleep is light.
But it cant be resume. No button can do resume.

Some useful info:
hw.acpi : http://pastebin.com/zknEPdVS
acpidump : http://pastebin.com/uH4hXywR
dmesg : http://pastebin.com/wdqi7mfW

In /var/log/message: http://pastebin.com/fcWKMUd7
Jul  2 16:43:22 x201i acpi: suspend at 20120702 16:43:22
[It Can't resume, so I push power force to close my x201. ]
Jul  2 16:52:11 x201i syslogd: kernel boot file is /boot/kernel/kernel

#uname -a
FreeBSD x201i.honestqiao 9.0-STABLE FreeBSD 9.0-STABLE #0: Wed Jun 13 22:36:36 
CST 2012     root@x201i.honestqiao:/usr/obj/usr/src/sys/GENERIC  amd64
#vmstat -i 
interrupt                          total       rate
irq1: atkbd0                          16          0
irq9: acpi0                          727          4
irq19: ehci1                         338          2
irq23: ehci0                         255          1
cpu0:timer                          7607         50
irq264: em0                          135          0
irq265: hdac0                         66          0
irq266: iwn0                       15781        105
irq267: ahci0                       5732         38
cpu1:timer                          1578         10
cpu3:timer                          1819         12
cpu2:timer                          1510         10
irq268: vgapci0                        3          0
Total                              35567        237

#kldstat 
Id Refs Address            Size     Name
 1   85 0xffffffff80200000 1301fa8  kernel
 2    1 0xffffffff81502000 2087f0   zfs.ko
 3    2 0xffffffff8170b000 5c68     opensolaris.ko
 4    2 0xffffffff81711000 484e0    linux.ko
 5    1 0xffffffff8175a000 f4d8     aio.ko
 6    1 0xffffffff8176a000 29e0     coretemp.ko
 7    1 0xffffffff8176d000 3028     amdtemp.ko
 8    1 0xffffffff81771000 27398    drm.ko
 9    1 0xffffffff81799000 ba40     mmc.ko
10    1 0xffffffff817a5000 4218     mmcsd.ko
12    1 0xffffffff817b0000 6568     cuse4bsd.ko
13    1 0xffffffff817b7000 de08     tmpfs.ko
14    3 0xffffffff817c5000 8ab0     libiconv.ko
15    1 0xffffffff817ce000 24c8     libmchain.ko
16    1 0xffffffff817d1000 11c8     cd9660_iconv.ko
17    1 0xffffffff817d3000 11e0     msdosfs_iconv.ko
18    1 0xffffffff817d5000 10768    cpufreq.ko
19    1 0xffffffff817e6000 59b8     acpi_ibm.ko
20    1 0xffffffff817ec000 6668     sem.ko
21    1 0xffffffff81a12000 15c2     fdescfs.ko
22    1 0xffffffff81a14000 3dfd     linprocfs.ko
23    1 0xffffffff81a18000 a9bb     fuse.ko
24    1 0xffffffff81a23000 5f7b7    i915kms.ko
25    1 0xffffffff81a83000 123d     iicbb.ko
26    4 0xffffffff81a85000 12ff     iicbus.ko
27    1 0xffffffff81a87000 dc9      iic.ko
28    1 0xffffffff81a88000 2be29    drm2.ko

#sysctl dev.acpi_ibm 
dev.acpi_ibm.0.%desc: IBM ThinkPad ACPI Extras
dev.acpi_ibm.0.%driver: acpi_ibm
dev.acpi_ibm.0.%location: handle=\_SB_.PCI0.LPC_.EC__.HKEY
dev.acpi_ibm.0.%pnpinfo: _HID=IBM0068 _UID=0
dev.acpi_ibm.0.%parent: acpi0
dev.acpi_ibm.0.initialmask: 2060
dev.acpi_ibm.0.availmask: 134217727
dev.acpi_ibm.0.events: 1
dev.acpi_ibm.0.eventmask: 134217727
dev.acpi_ibm.0.hotkey: 388
dev.acpi_ibm.0.lcd_brightness: 0
dev.acpi_ibm.0.volume: 7
dev.acpi_ibm.0.mute: 0
dev.acpi_ibm.0.thinklight: 0
dev.acpi_ibm.0.bluetooth: 0
dev.acpi_ibm.0.wlan: 1
dev.acpi_ibm.0.fan_speed: 3265
dev.acpi_ibm.0.fan_level: 2
dev.acpi_ibm.0.fan: 0

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