---
name: "upd"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/upd"
---

# upd(4)

USB Power Devices sensor

## NAME

**upd** – USB Power Devices sensor

## SYNOPSIS

**upd\* at uhidev?**

## DESCRIPTION

The **upd** driver provides support for monitoring various sensors provided by USB Power Devices (such as a UPS). Supported sensor values are made available via the [sysctl(8)](/sysctl/8.md) interface.

The following sensors are supported by the driver:

-

  BatteryPresent

-

  ShutdownImminent

-

  ACPresent

-

  PercentLoad

-

  Overload

-

  RelativeStateOfCharge

-

  AbsoluteStateOfCharge

-

  RemainingCapacity

-

  FullChargeCapacity

-

  Charging

-

  Discharging

-

  AtRateTimeToFull

-

  AtRateTimeToEmpty

-

  RunTimeToEmpty

-

  NeedReplacement

## SEE ALSO

[intro(4)](/intro/4.md), [uhidev(4)](/uhidev/4.md), [sensorsd.conf(5)](/sensorsd.conf/5.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md)

The USB Power Devices specification can be found at: **https://www.usb.org/hid**

## HISTORY

The **upd** driver first appeared in OpenBSD 5.6.

## AUTHORS

The **upd** driver was written by Andre de Oliveira.

## BUGS

The **upd** driver does not indicate device health via aggregate or individual sensor status. Users who wish to monitor **upd** status using [sensorsd(8)](/sensorsd/8.md) must manually establish “high” and “low” limits for sensor values of interest via [sensorsd.conf(5)](/sensorsd.conf/5.md).