---
name: "acpi_toshiba"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/acpi_toshiba"
---

# acpi\_toshiba(4)

Toshiba HCI interface

## NAME

**acpi\_toshiba** – Toshiba HCI interface

## SYNOPSIS

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

**device acpi\_toshiba**

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

```
acpi_toshiba_load="YES"
```

## DESCRIPTION

HCI is Toshiba's *Hardware Control Interface* which is somewhat uniform across their models. The **acpi\_toshiba** driver allows the user to manipulate HCI-controlled hardware using a number of [sysctl(8)](/sysctl/8.md) variables.

## SYSCTL VARIABLES

The following sysctls are currently implemented:

- *hw.acpi.toshiba.force\_fan*

  Causes active cooling to be forcibly enabled (‘1’) or disabled (‘0’) regardless of the current temperature.

- *hw.acpi.toshiba.video\_output*

  Sets the active display to use according to a bitwise OR of the following:

  - 0

    No display

  - 1

    LCD

  - 2

    CRT

  - 4

    TV-Out

    Only some systems (i.e., the Libretto L5) support video switching via this hardware-specific driver. Use the [acpi\_video(4)](/acpi_video/4.md) driver for generic video output support.

- *hw.acpi.toshiba.lcd\_brightness*

  Makes the LCD backlight brighter or dimmer (higher values are brighter).

- *hw.acpi.toshiba.lcd\_backlight*

  Turns the LCD backlight on and off.

- *hw.acpi.toshiba.cpu\_speed*

  Sets the CPU speed to the specified speed. This provides functionality similar to the *hw.acpi.cpu.throttle\_state* variable. Higher sysctl values mean lower CPU speeds.

Defaults for these variables can be set in [sysctl.conf(5)](/sysctl.conf/5.md), which is parsed at boot-time.

## LOADER TUNABLES

The *hw.acpi.toshiba.enable\_fn\_keys* tunable enables or disables the function keys on the keyboard. Function keys are enabled by default.

This behaviour can be changed at the [loader(8)](/loader/8.md) prompt or in [loader.conf(5)](/loader.conf/5.md).

## SEE ALSO

[acpi(4)](/acpi/4.md), [acpi\_video(4)](/acpi_video/4.md), [loader.conf(5)](/loader.conf/5.md), [sysctl.conf(5)](/sysctl.conf/5.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **acpi\_toshiba** driver first appeared in FreeBSD 5.1.

## AUTHORS

The **acpi\_toshiba** driver was written by Hiroyuki Aizu ⟨*aizu@navi.org*⟩. This manual page was written by Philip Paeps ⟨*philip@FreeBSD.org*⟩.