程序运行在IMX6 SOLO上，采用EGLFS，15分钟后自动黑屏

imx6 solo eglfs Qt 5.9.7 qml程序运行15分钟后显示黑屏

同样的程序使用Qt5.5.1运行却没有这样的问题。

Platform: i.MX6 solo, yocto 3.10.31

I have an application running with Qt 5.5.1 on i.MX6 solo, and it's ok

When I update framework to Qt 5.9.7, something stange occur, the display will turn black

after 15 mins while the application is still running.

After searching the guide documents of i.MX6 solo, I find that Qt 5.9.7 will change this value:

/sys/class/graphics/fb0/blank

to 0, menas display on

to 1, means display off, which looks like display has been turned black

Thank you.