1、问题

1、 无法自启动
2、 启动时无法加载外部字体和图片

2、解决方案

1、将文件/etc/systemd/system/multi-user.target.wants/phytec-qtdemo.service中启动文件改为自己要自启动的，如下：

[Unit]
Description=Autostart Qt 5 Demo
Wants=systemd-udev-settle.service
After=systemd-udev-settle.service

[Service]
Type=simple
User=root
WorkingDirectory=/usr/bin/
ExecStart=/usr/bin/qtLauncher /usr/bin/BM

# Detach the framebuffer console from fb0 before starting the QtDemo and
# reattach it after QtDemo has stopped.
# See <linux>/Documentation/fb/fbcon.txt for details.
# NOTE: The dash "-" allows the commands to fail, e.g. if no virtual console
# was started.
# FIXME Is there a better command without shell invocation?
ExecStartPre=-/bin/sh -c "echo 0 > /sys/devices/virtual/vtconsole/vtcon1/bind"
ExecStopPost=-/bin/sh -c "echo 1 > /sys/devices/virtual/vtconsole/vtcon1/bind; echo -n -e '\033[9;0]' > /dev/tty0"

[Install]
WantedBy=multi-user.target

2、在文件/etc/systemd/system/multi-user.target.wants/phytec-qtdemo.service中增加WorkingDirectory，并设置为启动程序目录。