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Zedboard No HDMI Output after 10 minutes

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Hello!
    I am working on a project with zedboard . I need to output images to the monitor via HDMI interface . I download a demo zedboard-oob-design from official website and run linux on zedboard successfully.The images can be output via hdmi successfully,but it can only work for about 12 minutes.There will be no HDMI output after 12 minutes,but I can still control OLED and LEDs on the terminal.I need the board keep displaying images via hdmi for at least 30 minutes.I don't know how to work around it .  I really need your help!Thanks a lot!
  
Regards,
Xiao Yuan

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    Hi folks,

    I believe that what you are seeing is a default behavior for Linux rather than something specific to ZedBoard.  I think the reasoning behind the timeout is for when you have a monitor connected to a VGA command prompt of a server sitting in a closet, that the monitor does not get phosphor burn in from showing a command prompt to the display for years on end.

    That being said, I was able to duplicate the behavior that you were seeing with my ZedBoard where the display would blank after about 12 minutes of idle time.

    I did some research and found that there is a kernel boot argument named "consoleblank" which can be used to control the timeout.

    According to the kernel documentation:

    "consoleblank=N; defaults to 600 (10 minutes); affects all real VTs; affects screen sessions in a VT; no way to set while running."

    If you add the kernel boot argument "consoleblank=0" to the list of your existing boot arguments, you should no longer observe the timeout blanking.

    I tried this for the ZedBoard Digilent OOB SD Card image by modifying the bootargs settings within the devicetree and so far I have seen the Tux Penguins shown continuously for over an hour now on my HDMI display.  Can you try the same thing on your end and see if that works for you as well?

    Regards,

    -Kevin

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  • 0

    Hi folks,

    I believe that what you are seeing is a default behavior for Linux rather than something specific to ZedBoard.  I think the reasoning behind the timeout is for when you have a monitor connected to a VGA command prompt of a server sitting in a closet, that the monitor does not get phosphor burn in from showing a command prompt to the display for years on end.

    That being said, I was able to duplicate the behavior that you were seeing with my ZedBoard where the display would blank after about 12 minutes of idle time.

    I did some research and found that there is a kernel boot argument named "consoleblank" which can be used to control the timeout.

    According to the kernel documentation:

    "consoleblank=N; defaults to 600 (10 minutes); affects all real VTs; affects screen sessions in a VT; no way to set while running."

    If you add the kernel boot argument "consoleblank=0" to the list of your existing boot arguments, you should no longer observe the timeout blanking.

    I tried this for the ZedBoard Digilent OOB SD Card image by modifying the bootargs settings within the devicetree and so far I have seen the Tux Penguins shown continuously for over an hour now on my HDMI display.  Can you try the same thing on your end and see if that works for you as well?

    Regards,

    -Kevin

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