---
name: "acpi_sony"
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_sony"
---

# acpi\_sony(4)

ACPI notebook controller driver for Sony laptops

## NAME

**acpi\_sony** – ACPI notebook controller driver for Sony laptops

## SYNOPSIS

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

**device acpi\_sony**

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

```
acpi_sony_load="YES"
```

## DESCRIPTION

The **acpi\_sony** driver provides support for the notebook controller in Sony laptops. Note that not all features will work on all laptop models.

## SYSCTLS

The following sysctl nodes are currently implemented:

- *dev.acpi\_sony.0.brightness*

  Current brightness level of the display.

- *dev.acpi\_sony.0.brightness\_default*

  Default brightness level of the display (survives reboot).

- *dev.acpi\_sony.0.contrast*

  Current contrast level of the display.

- *dev.acpi\_sony.0.bass\_gain*

  Enable or disable the Bass Gain feature.

- *dev.acpi\_sony.0.cdp*

  Turns the CD power on or off.

- *dev.acpi\_sony.0.azp*

  Turns the audio power on or off.

- *dev.acpi\_sony.0.lnp*

  Turns the wired network interface power on or off.

## SEE ALSO

[acpi(4)](/acpi/4.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **acpi\_sony** driver first appeared in FreeBSD 6.0.

## AUTHORS

The **acpi\_sony** driver was written by Takanori Watanabe ⟨*takawata@FreeBSD.org*⟩.