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      acpi_panasonic - ACPI hotkey driver for Panasonic laptops


      device acpi_panasonic


      The acpi_panasonic driver enables such hotkey facilities of various Pana‐
      sonic 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 occur‐
devd(8).  The
      third and last is to provide a way to adjust LCD brightness and sound
      There are 9 hotkeys available on the supported hardwares:
            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
devd(8) should take the role as described below.
devd(8) Events
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
                          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.  The value is read only and
              automatically set according to hardware model.
              The minimum level of brightness.  The value is read only and
              automatically set according to hardware model.
              Current brightness level of the LCD (read-write).  The value
              ranges from hw.acpi.panasonic.lcd_brightness_min to
              A read-write boolean flag to control whether to mute the speaker.
              The value 1 means to mute and 0 not.


      The acpi_panasonic driver first appeared in FreeBSD 5.3.


      The acpi_panasonic driver and this manual page were written by OGAWA
      Takaya 〈t-ogawa@triaez.kaisei.org〉 and TAKAHASHI Yoshihiro


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