HP omnibook vt6200, suspend w/9.2

Hi Does anybody know how to get suspend to ram and suspend to disk working with the HP omnibook vt6200? I've got a used model of this otherwise nice machine, but this troubles me. The former owner says that up to a point in time, it was able to restart after suspending. I'm not sure if it was with ACPI though. Problem is that it suspends OK, but doesn't resume. It turns on, but then it hangs. Even with all kinds of debug information turned on, there doesn't seem to be any indication of what is hanging. :-(