Userspace debugger accessiblity

modulename: acpi_dbg.ko

configname: CONFIG_ACPI_DEBUGGER_USER

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>Userspace debugger accessiblity
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
to access the debugger functionalities.

source code:
drivers/acpi/acpi_dbg.c