Shutdown fails with many versions of Puppy. The computers hang at system halted and users need to press the power off button on their box.

Can be (usually) solved by editing menu.lst by adding acpi=on/off/force

This is referenced in multiple threads over the forum. I do not know where to start with the links, here are two for starters:-

http://murga-linux.com/puppy/viewtopic.php?t=49029 http://murga-linux.com/puppy/viewtopic.php?t=22451

Comment deleted

The following posting describes a solution for older PCs that rely on APM instead of ACPI. The solution works on my 1997 Aptiva. The solution is to add the argument, power_off=1, to the "modprobe apm" command in script /etc/rc.d/rc.sysinit, line 249 in puppy 4.3.1. The command is executed only if there is no indication that ACPI is available. Is there any reason this argument should not be added permanently? http://www.murga-linux.com/puppy/viewtopic.php?p=343850#343850