ACPI problems with Dell Latitude CPx on 5.2-RELEASE

[Baldur Gislason]

I have a Dell Latitude CPx H500GT with BIOS revision A14.
I'm running FreeBSD 5.2-RELEASE.
When the machine enters ACPI state S1 all is well until I want to wake the 
system up again, then it fires up the display with a blinking cursor for a 
few seconds and then turns the backlight off again. state S3 kind of works, 
but gives lots of I/O errors when waking up and the clock also stops so I 
need to resync with NTP after sleep.
Any ideas on how to get S1 working?

Baldur