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How to disable energy saving, make lcd backlight always on?

Cao Yiling
Intellectual 400 points

Hi, I am trying to make a display always on, on am335x, with Ti latest kernel 3.2.0 and ubuntu armhf 13.04 distro.

When I type `startx xterm`, I will start up a terminal, but after a while of inactivity (about 1-2 mins) the backlight turned off, unless you move a mouse or touch some key action. 

This happens with all my custom app. and kernel throw a dmesg "LCD Controller timed out"

Where should I turn this feature off? kernel or user program? Thanks!

  • 0
    Expert 1990 points

    Not sure about solution, but try to see in make menu, may be you may find some relevant term to set up. 

    best luck

  • 0
    Expert 1355 points

    Hi Cao,

      You have not mentioned the board you are using like Stater kit or GP EVM, 

    I hope in all the boards mcasp0_ahclkr(gpio3_17) is used to control display back light.

    In kernel make this pin as gpio and export it to user space & set it to high in sys folder 

    so that  LCD will stop becoming blank at regular intervals

    Rajeev