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Problem with frame buffer blank in linux

  • Hello,

    I developed an application in qt quick for imx6 and run it on linux 4.1.36 and it works fine the only problem I have is that when I try to blank the screen to save the energy by below command :

    echo 1 > /sys/classes/graphics/fb0/blank

    And unblank it again the behaviour is undefined, sometimes it works fine sometimes the screen start flickering and sometime it hangs and I have to restart the system!

    Another weird thing is that my system has auto blank feature so it blanks the screen when there is no user activity but when i run qt quick application even its own qt quick example application the screen never blank!

    Linux 4.1.36
    Qt sdk 5.9 and 5.11

    Thanks in advance for your time and help


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