Unable to resume amd64 machine

   Hi,

   I've trying to suspend/resume an amd64 machine. The machine is a 
fujitsu S710 laptop running:

          FreeBSD 10.0-CURRENT #4 r237339=e61ad3a-dirty: Sat Jun 23 
17:12:58 CEST 2012

   I did the tests in the following conditions:

   - No X running. Everything in console. The machine has an Intel video 
card, but I did the tests without the i915kms module.
   - I removed all the modules I could from the kernel.

   The behavior is basically the machine seems to suspend fine (I see 
the power led blinking) but when resuming it freezes hard. I see the 
disk spinning for a while and then it stops. I can't ssh to it, I can't 
use the keyboard at all so I can issue no command at all.

   I've tried stripping down the kernel (everything is out except 
if_ath, em and usb stack). No pccard, no sdhci, no sound, no cuse4bsd, 
no usb hid devices (I'm using uhidd for hid devices), no acpi_video or 
acpi_fujitsu there but the same result.

   I tried enabling debug.acpi.resume_beep=1. When doing this, the 
laptop beeped like crazy.

   I tried using the serial console on the laptop. I saw the suspend 
process taking down some usb devices. Resume showed nothing on the 
serial console.