linux/Documentation/acpi/method-tracing.txt
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   1/sys/module/acpi/parameters/:
   2
   3trace_method_name
   4        The AML method name that the user wants to trace
   5
   6trace_debug_layer
   7        The temporary debug_layer used when tracing the method.
   8        Using 0xffffffff by default if it is 0.
   9
  10trace_debug_level
  11        The temporary debug_level used when tracing the method.
  12        Using 0x00ffffff by default if it is 0.
  13
  14trace_state
  15        The status of the tracing feature.
  16
  17        "enabled" means this feature is enabled
  18        and the AML method is traced every time it's executed.
  19
  20        "1" means this feature is enabled and the AML method
  21        will only be traced during the next execution.
  22
  23        "disabled" means this feature is disabled.
  24        Users can enable/disable this debug tracing feature by
  25        "echo string > /sys/module/acpi/parameters/trace_state".
  26        "string" should be one of "enable", "disable" and "1".
  27
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