/sys/module/acpi/parameters/:
  
  trace_method_name
  	The AML method name that the user wants to trace
  
  trace_debug_layer
  	The temporary debug_layer used when tracing the method.
  	Using 0xffffffff by default if it is 0.
  
  trace_debug_level
  	The temporary debug_level used when tracing the method.
  	Using 0x00ffffff by default if it is 0.
  
  trace_state
  	The status of the tracing feature.
  
  	"enabled" means this feature is enabled
  	and the AML method is traced every time it's executed.
  
  	"1" means this feature is enabled and the AML method
  	will only be traced during the next execution.
  
  	"disabled" means this feature is disabled.
  	Users can enable/disable this debug tracing feature by
  	"echo string > /sys/module/acpi/parameters/trace_state".
  	"string" should be one of "enable", "disable" and "1".