Provided by: freebsd-manpages_12.2-1_all bug


     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



     The acpi_panasonic driver enables such hotkey facilities of various Panasonic laptops as
     changing LCD brightness, controlling mixer volumes, entering 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 occurrences 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 information:

           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 corresponds to Fn+F2,
                       and so on.

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


     The following MIBs are available:
             The maximum level of brightness.  This read-only value is automatically set
             according to hardware model.
             The minimum level of brightness.  This read-only value is automatically set
             according to hardware model.
             Current brightness level of the LCD (read-write).  The value ranges from
             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 <>.