1 通过help有哪些参数

130|:/ # modetest -h
usage: modetest [-acDdefMPpsCvrw]

 Query options:

        -c      list connectors
        -e      list encoders
        -f      list framebuffers
        -p      list CRTCs and planes (pipes)

 Test options:

        -P <plane_id>@<crtc_id>:<w>x<h>[+<x>+<y>][*<scale>][@<format>]  set a plane
        -s <connector_id>[,<connector_id>][@<crtc_id>]:[#<mode index>]<mode>[-<vrefresh>][@<format>]    set a mode
        -C      test hw cursor
        -v      test vsynced page flipping
        -r      set the preferred mode for all connectors
        -w <obj_id>:<prop_name>:<value> set property
        -a      use atomic API
        -F pattern1,pattern2    specify fill patterns

 Generic options:

        -d      drop master after mode set
        -M module       use the given driver
        -D device       use the given device

        Default is to dump all info.

2 分3大类

2.1 查询

Query options:
        -c      list connectors
        -e      list encoders
        -f      list framebuffers
        -p      list CRTCs and planes (pipes)

2.2 测试

Test options:
        -P <plane_id>@<crtc_id>:<w>x<h>[+<x>+<y>][*<scale>][@<format>]  set a plane
        -s <connector_id>[,<connector_id>][@<crtc_id>]:[#<mode index>]<mode>[-<vrefresh>][@<format>]    set a mode
        -C      test hw cursor
        -v      test vsynced page flipping
        -r      set the preferred mode for all connectors
        -w <obj_id>:<prop_name>:<value> set property
        -a      use atomic API
        -F pattern1,pattern2    specify fill patterns

2.3 通用设置

 Generic options:

        -d      drop master after mode set
        -M module       use the given driver
        -D device       use the given device

3 常用命令（RK平台）

• Query options 查询选项其实可以不用关心，执行modetest就会全部打印出来，保存文件再去找对应需要的内容即可，重点在测试与通用设置

3.1 修改Connectors id 为445的属性brightness为30

// -w <obj_id>:<prop_name>:<value> set property
modetest -M rockchip -w 445:brightness:30

3.2 Connectors id 为445的屏幕为彩条模式（800x1280）

// -s <connector_id>[,<connector_id>][@<crtc_id>]:[#<mode index>]<mode>[-<vrefresh>][@<format>]
// 直接设置分辨率
modetest -M rockchip -s 445:800x1280
//设置分辨率和刷新率
modetest -M rockchip -s 445:800x1280-60.08
// 通过#查找第0个mode
modetest -M rockchip -s 445:#0

3.3 查询

modetest -M rockchip