大家在購買開發(fā)板后，默認開機進入桌面屏幕顯示方向是豎屏，有些用戶想修改為橫屏顯示，本文就用IDO-EVB3568為例，用Debian系統(tǒng)演示如何旋轉(zhuǎn)屏幕顯示方向，此方法適用于所有RK356X系列產(chǎn)品。

IDO-EVB3568開發(fā)板擁有四核A55，主頻高達2.0G，支持高達8GB高速LPDDR4，1T算力NPU ，4K H.265硬解碼，4K HDMI2.0顯示輸出，支持雙通道LVDS/eDP/兩路MIPI DSI 等多種顯示接口，支持3屏異顯。板載2路千兆以太網(wǎng)，雙頻WIFI+藍牙，支持5G或4G通信，支持2路USB3.0和7路USB2.0/SATA3.0，5路串口(TTL/RS232/RS485)，2路CAN總線。

支持Android11/Debian10/Ubuntu20/Buildroot/麒麟OS/開源鴻蒙等多種操作系統(tǒng)。

更多產(chǎn)品資料可查看深圳觸覺智能官網(wǎng)

解決辦法
手動旋轉(zhuǎn)使用xrandr命令實現(xiàn)：

xrandr -o left/right/normal/inverted

left/right/normal/inverted表示4個方向。

使用xrandr旋轉(zhuǎn)的效果是一次性的，系統(tǒng)重啟后屏幕顯示方向會還原。 如果要開機自動旋轉(zhuǎn)，則需要修改配置文件：/etc/X11/xorg.conf.d/20-modesetting.conf。

Section "Device"
    Identifier  "Rockchip Graphics"
    Driver      "modesetting"

### Use Rockchip RGA 2D HW accel
#    Option      "AccelMethod"    "exa"

### Use GPU HW accel
    Option      "AccelMethod"    "glamor"

    Option      "DRI"            "2"

### Set to "always" to avoid tearing, could lead to up 50% performance loss
    Option      "FlipFB"         "always"

### Limit flip rate and drop frames for "FlipFB" to reduce performance lost
#    Option      "MaxFlipRate"    "60"

    Option      "NoEDID"         "true"
    Option      "UseGammaLUT"    "true"
EndSection

Section "Screen"
    Identifier  "Default Screen"
    Device      "Rockchip Graphics"
    Monitor     "Default Monitor"
EndSection

### Valid values for rotation are "normal", "left", "right"
Section "Monitor"
#    Identifier "Default Monitor"
    Identifier  "DSI-1"
    Option      "Rotate" "left"
EndSection

其中Section "Monitor"下的【Identifier "DSI-1"】表示旋轉(zhuǎn)屏幕DSI-1，【Option "Rotate" "left"】表示向左旋轉(zhuǎn)。這樣修改后，重啟設備，屏幕旋轉(zhuǎn)設置生效。

當前系統(tǒng)中可用的屏幕ID可通過以下命令查看：

linaro@linaro-alip:~$ sudo cat /sys/kernel/debug/dri/0/summary
Video Port0: ACTIVE
    Connector: DSI-1
        bus_format[100a]: RGB888_1X24
        overlay_mode[0] output_mode[0] color_space[0]
    Display mode: 1920x1080p60
        clk[148500] real_clk[148500] type[48] flag[a]
        H: 1920 2052 2112 2200
        V: 1080 1084 1116 1125
    Smart0-win0: ACTIVE
        win_id: 0
        format: XR24 little-endian (0x34325258) SDR[0] color_space[0] glb_alpha[0xff]
        rotate: xmirror: 0 ymirror: 0 rotate_90: 0 rotate_270: 0
        csc: y2r[0] r2y[0] csc mode[0]
        zpos: 0
        src: pos[0, 0] rect[1920 x 1080]
        dst: pos[0, 0] rect[1920 x 1080]
        buf[0]: addr: 0x00000000007e9000 pitch: 7680 offset: 0
Video Port1: ACTIVE
    Connector: HDMI-A-1
        bus_format[100a]: RGB888_1X24
        overlay_mode[0] output_mode[f] color_space[0]
    Display mode: 1920x1080p60
        clk[148500] real_clk[148500] type[0] flag[5]
        H: 1920 2008 2052 2200
        V: 1080 1084 1089 1125
    Smart1-win0: ACTIVE
        win_id: 1
        format: XR24 little-endian (0x34325258) SDR[0] color_space[0] glb_alpha[0xff]
        rotate: xmirror: 0 ymirror: 0 rotate_90: 0 rotate_270: 0
        csc: y2r[0] r2y[0] csc mode[0]
        zpos: 1
        src: pos[0, 0] rect[1920 x 1080]
        dst: pos[0, 0] rect[1920 x 1080]
        buf[0]: addr: 0x00000000007e9000 pitch: 7680 offset: 0

審核編輯黃宇