modetest 命令

常用示例

说明

modetest is a diagnostic tool for testing and debugging Kernel Mode Setting (KMS) functionality of Direct Rendering Manager (DRM) drivers. It enumerates DRM objects including connectors, encoders, CRTCs, and planes, and can set display modes directly. The tool is part of libdrm and provides low-level access to the graphics subsystem for testing display configurations, pixel formats, and plane overlays. When no query or test options are given, it dumps all available DRM information. It displays an SMPTE color bar test pattern when setting modes.

参数

-M _module_

Use the given DRM driver module (e.g., i915, amdgpu, nouveau)

-D _device_

Use the given DRM device node

-c

List connectors and their available modes

-e

List encoders

-f

List framebuffers

-p

List CRTCs and planes

-s _connector_id,connector_id@crtc_id:mode-vrefresh@format_

Set a mode on one or more connectors

**-P _plane_id@crtc_id:WxH+X+Y*scale@format_**

Test a plane with specified configuration

-C

Test hardware cursor

-v

Test vsynced page flipping

-w _obj_id:prop_name:value_

Set a property on a DRM object

-a

Use atomic mode setting API

-F _pattern1,pattern2_

Specify fill patterns for test image

-d

Drop DRM master after mode set