acpitool

command line ACPI client
AcpiTool is a Linux ACPI client. It's a small command line application,
intended to be a replacement for the apm tool. The primary target audience are
laptop users, since these people are most interested in things like battery
status, thermal status and the ability to suspend (sleep mode). The program
simply accesses the /proc/acpi or /sysfs entries to get or set ACPI values.
It also supports various extensions for Toshiba, Asus, and IBM Thinkpad
laptops.