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ACPI_PANASONIC(4)	 BSD Kernel Interfaces Manual	     ACPI_PANASONIC(4)

     acpi_panasonic -- ACPI hotkey driver for Panasonic	laptops

     To	compile	this driver into the kernel, place the following line in your
     kernel configuration file:

	   device acpi_panasonic

     Alternatively, to load the	driver as a module at boot time, place the
     following line in loader.conf(5):


     The acpi_panasonic	driver enables such hotkey facilities of various Pana-
     sonic laptops as changing LCD brightness, controlling mixer volumes, en-
     tering sleep or suspended state and so on.	 On the	following models it is
     reported to work: Let's note (or Toughbook, outside Japan)	CF-R1N,	CF-R2A
     and CF-R3.	 It may	also work on other models as well.

     The driver	consists of three functionalities.  The	first is to detect
     hotkey events and take corresponding actions, which include changing LCD
     luminance and speaker mute	state.	The second role	is to notify occur-
     rences of the event by way	of devctl(4) and eventually to devd(8).	 The
     third and last is to provide a way	to adjust LCD brightness and sound
     mute state	via sysctl(8).

     There are 9 hotkeys available on the supported hardware:

	   Fn+F1       Make LCD	backlight darker.
	   Fn+F2       Make LCD	backlight brighter.
	   Fn+F3       Switch video output between LCD and CRT.	 Not supported
		       by the acpi_panasonic driver.
	   Fn+F4       Toggle muting the speaker.
	   Fn+F5       Turn the	mixer volume down.
	   Fn+F6       Turn the	mixer volume up.
	   Fn+F7       Enter suspend-to-RAM state.
	   Fn+F9       Show battery status.
	   Fn+F10      Enter suspend-to-disk state.

     Actions are automatically taken within the	driver for Fn+F1, Fn+F2	and
     Fn+F4.  For the other events such as mixer	control	and showing battery
     status, devd(8) should take the role as described below.

   devd(8) Events
     When notified to devd(8), the hotkey event	provides the following infor-

	   system      "ACPI"
	   subsystem   "Panasonic"
	   type	       The source of the event in ACPI namespace.  The value
		       depends on the model but	typically "\_SB_.HKEY".
	   notify      Event code (see below).

     Event codes to be generated are assigned as follows:

	   0x81-0x86, 0x89
		       Fn+F<n> pressed.	 0x81 corresponds to Fn+F1, 0x82 cor-
		       responds	to Fn+F2, and so on.

	   0x01-0x07, 0x09, 0x1a
		       Fn+F<n> released.  0x01 corresponds to Fn+F1, 0x02 cor-
		       responds	to Fn+F2, and so on.

     The following MIBs	are available:
	     The maximum level of brightness.  This read-only value is auto-
	     matically set according to	hardware model.
	     The minimum level of brightness.  This read-only value is auto-
	     matically set according to	hardware model.
	     Current brightness	level of the LCD (read-write).	The value
	     ranges from to
	     A read-write boolean flag to control whether to mute the speaker.
	     The value 1 means to mute and 0 not.

     acpi(4), devd.conf(5), devd(8), sysctl(8)

     The acpi_panasonic	driver first appeared in FreeBSD 5.3.

     The acpi_panasonic	driver and this	manual page were written by OGAWA
     Takaya <>	and TAKAHASHI Yoshihiro

BSD				 June 19, 2015				   BSD


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