Hi all,
if your system is currently able to suspend and wake up again,
please try using options VGA_POST and X86EMU with
machdep.acpi_vbios_reset=0.

I have prepared two generic kernels as of today with the changes above,
so just using sysctl -w machdep.sleep_state=3 from single user mode is
enough for testing. Please report if that code doesn't work for you.
If it doesn't, also report (a) if it works with
machdep.acpi_vbios_reset=1 in the normal kernel or (b) if you are using
vbetool post. It also helps if /sbin/shutdown -r now typed blindly
reboots the system.

The kernels are 
ttp://www.netbsd.org/~joerg/netbsd-vgapost-i386.bz2
http://www.netbsd.org/~joerg/netbsd-vgapost-amd64.bz2

Thanks for testing.

Joerg