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Software o linux command to turn off / on LCD


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#1 Fabry

Fabry

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Posted 03 January 2011 - 05:38 PM

On my Flytouch's lcd doesn't start at every first power on after a power off longer than some minutes.

So I must use one of these workarounds to use it:
  • Power on, press reset button and then re-power on
  • Power on holding Home button and then after few secs press Menu button.
    This reset and reboot the tablet and LCD magically turn on
  • Boot without LCD, login (vibrator tell you if your finger is on correct position) and then ask a power off.
    At next power on (if done a few seconds after power off) LCD will turn on

Now I have issues with seller for tablet replacing and with this problem I can't also resell it

If exists a linux command or program that can be used by script to turn off and then turn on LCD screen, probably I can try to alter boot process to include it as internal workaround.

#2 Fabry

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Posted 13 January 2011 - 08:43 PM

I found by myself the linux's commands, but I haven't tried yet if this can solve my problem.

However commands from a xterm console (or within a script) with root permissions are:
  • To turn off lcd backlight:
    echo "1" > /sys/devices/platform/imapx200-lcd-backlights/backlight/lcd-backlight/bl_power
  • To turn on lcd backlight:
    echo "0" > /sys/devices/platform/imapx200-lcd-backlights/backlight/lcd-backlight/bl_power
  • To change lcd brightness:
    echo "value" > /sys/devices/platform/imapx200-lcd-backlights/backlight/lcd-backlight/brightness

  • value range is from 0 to 255
  • 0 is equal as visual effect to backlight OFF, but backlight is still ON
  • 1 is minimal brightness
  • 255 is max brightness
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