I've updated to current (4.99.42) after jmcneill-pm is merged.
Almost okay including suspend/resume.
# some devices needed to add pmf_device_register().

But when I do 'zzz' in terminal on X Window, X server has fallen 
down after resuming, and xdm's come up again.

In the case of sysctl -w machdep.acpi_vbios_reset=0, black out
after resume.

I'm using X.org 6.9.
Possibly, is it solved by using latest X server?

----------------------------------------------------------------------
Masahiko KIMOTO, Ph. D.
E-mail: kimoto@ohnolab.org        URL: http://www.ohnolab.org/~kimoto