For Dell machines that are without a battery, i8kmon wont start.
The first is that acpi may not be installed, and this causes the defaults for the script to terminate.
The second is that if acpi is installed, executing it returns No support for device type: power_supply, which also causes the script to terminate.
If you're reading this, you can hack around it by adding this to your i8kmon.conf
set config(acpi) /usr/bin/true
Proposal would be for the script to test for the existence of the binary, or the return text showing it's not there, and continue as normal.