By default the atkbd driver will install even if a keyboard is not actually connected to the system. This option prevents the driver from being installed in this situation.
bit 1 (NO_RESET)
When this option is given, the atkbd driver will not reset the keyboard when initializing it. It may be useful for laptop computers whose function keys have special functions and these functions are forgotten when the keyboard is reset.
bit 2 (ALT_SCANCODESET)
Certain keyboards, such as those on some ThinkPad models, behave like the old XT keyboard and require this option.
bit 3 (NO_PROBE_TEST)
When this option is given, the atkbd driver will not test the keyboard port during the probe routine. Some machines hang during boot when this test is performed.