---
name: "DPMSQueryExtension"
section: "3"
platform: "linux"
package: "libxext"
version: "1.3.7-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/DPMSQueryExtension"
---

# DPMSQueryExtension(3)

queries the X server to determine the availability of the DPMS Extension

## NAME

DPMSQueryExtension - queries the X server to determine the availability of the DPMS Extension

## SYNOPSIS

```
cc [ flag ... ] file ... -lXext [ library ... ]
#include <X11/extensions/dpms.h>

Bool DPMSQueryExtension (
      Display *display,
      int *event_base,
      int *error_base
);
```

## ARGUMENTS

- *display*

  Specifies the connection to the X server

- *event\_base*

  Specifies the return location for the assigned base event

- *error\_base*

  Specifies the return location for the assigned base error

## DESCRIPTION

The **DPMSQueryExtension** function queries the X server to determine the availability of the Display Power Management Signaling (DPMS) Extension. If the extension is available, it returns TRUE, and the *event\_base* and *error\_base* are set to the base event and error numbers, respectively. Otherwise, the return value is FALSE, and the values of *event\_base* and *error\_base* are undefined.

## RETURN VALUES

- **TRUE**

  The **DPMSQueryExtension** function returns TRUE if the extension is available, and *event\_base* and *error\_base* are set to the base event number and base error number for the extension, respectively.

- **FALSE**

  The **DPMSQueryExtension** function returns FALSE if extension is not available, and the values of *event\_base* and *error\_base* are undefined.

## SEE ALSO

[**DPMSGetVersion**(3)](/DPMSGetVersion/3.md)