I figured out that the log for acpid moved from /var/log/acpid to the syslog, which I can deal with. But what's bugging me is the log messages are less specific.
As an example, on my Thinkpad, hitting the Sleep key or similar used to log a messages like this:
received event "ibm/hotkey HKEY 00000080 00001004"
Now, that same action gives this in /var/log/messages:
logger: ACPI group ibm / action hotkey is not defined
I'm not worried about the "not defined" part because I haven't set up my events/actions yet.
The problem is that I've lost the specificity of which
hotkey just got hit. So, if I didn't have my old 12.1 setup to go by (for example a fresh install on a new machine), I'd have no way of figuring out what arguments to use in the events/actions.
This strikes me as a major loss. I'm less concerned about getting /var/log/acpid back than I am about restoring the full output to /var/log/messages. So far I haven't found a way to do that.