浏览器启动前屏幕会黑屏 15 秒。Raspberry Pi

Question

我在信息亭模式下使用 Chromium。无需鼠​​标和键盘即可使用触摸屏。浏览器在下面显示的 /boot/xinitrc 中启动。在启动时，我可以在屏幕上看到正在启动的不同进程，但最后在浏览器启动前屏幕变黑了大约 15 秒。出了什么问题？启动后的浏览器运行正常。

#!/bin/sh
while true; do

    # Clean up previously running apps, gracefully at first then harshly
    killall -TERM chromium 2>/dev/null;
    killall -TERM matchbox-window-manager 2>/dev/null;
    sleep 2;
    killall -9 chromium 2>/dev/null;
    killall -9 matchbox-window-manager 2>/dev/null;

    # Clean out existing profile information
    rm -rf /home/pi/.cache;
    rm -rf /home/pi/.config;
    rm -rf /home/pi/.pki;

    # Generate the bare minimum to keep Chromium happy!
    mkdir -p /home/pi/.config/chromium/Default
    sqlite3 /home/pi/.config/chromium/Default/Web\ Data "CREATE TABLE meta(key LONGVARCHAR NOT NULL UNIQUE PRIMARY KEY, value LONGVARCHAR); INSERT INTO meta VALUES('version','46');$

    # Disable DPMS / Screen blanking
    xset -dpms
    xset s off

    # Reset the framebuffer's colour-depth
    fbset -depth $( cat /sys/module/*fb*/parameters/fbdepth );

    # Hide the cursor (move it to the bottom-right, comment out if you want mouse interaction)
    xwit -root -warp $( cat /sys/module/*fb*/parameters/fbwidth ) $( cat /sys/module/*fb*/parameters/fbheight )

    # Start the window manager (remove "-use_cursor no" if you actually want mouse interaction)
    matchbox-window-manager -use_titlebar no -use_cursor no &

    # Start the browser (See http://peter.sh/experiments/chromium-command-line-switches/)
    chromium-browser  --app=http://localhost:8080/webvisu.htm

done;