The following file can be added to /etc/sensors.d/applesmc-isa-0300.conf:

chip "applesmc-isa-0300"
	label "temp1" "Ambient"
	label "temp2" "CPU Die"
	label "temp3" "-"
	label "temp4" "CPU Heatsink"
	label "temp5" "CPU Proximity"
	label "temp6" "-"
	label "temp7" "-"
	label "temp8" "-"
	label "temp9" "HDD Proximity"
	label "temp10" "-"
	label "temp11" "-"
	label "temp12" "MLB Proximity"
	label "temp13" "-"
	label "temp14" "MCP Die"
	label "temp15" "-"
	label "temp16" "MCP Proximity"
	label "temp17" "-"
	label "temp18" "-"
	label "temp19" "-"
	label "temp20" "-"
	label "temp21" "-"
	label "temp22" "-"
	label "temp23" "-"
	label "temp24" "ODD Proximity"

in order to monitor the hardware sensors on Mac devices running Linux.

In order for Linux to be able to reboot a Mac, the reboot parameter must be set to pci. This can be accomplished by editing either /etc/lilo.conf and adding:

append=" reboot=pci"

Or, for grub, edit /etc/default/grub and append reboot=pci to GRUB_CMDLINE_LINUX_DEFAULT:

GRUB_CMDLINE_LINUX_DEFAULT="reboot=pci"