Thanks, Doug. The T43 comes in two flavors, 1xxx and 2xxx. The 1xxx certainly worked better with ACPI. The 2xxx was certified to run MCP. I'm tempted to just run MCP on it.
When the machine freezes, the stick stops, the USB mouse stops (hmmm, maybe eliminate the USB mouse?), the clock stops, control-alt-delete does nothing, control alt shift numlock control alt shift numlock offers to dump to floppy disk.