I want to get in control of the backlight for my phone buttons (It is a Runbo X5, MTK6577 based).
According to some tutorials I found, I should edit the content of this file:
that is actually a link to this one:
I "cat"ted the content of the file when the backlight was off and on, and I read values of 0 and 255 respectively. So far, so good: that file must be involved somehow then.
Now, all the documentation I found (for instance this one) states that I should manually change that file content according to my will (for instance, 0 if you I the lights to be off), then making the file non-writeable; so that the system can't override the settings.
I did, and it did not worked. Now the file content is not overridden; it stays fixed to 0. However, the button keep getting lit as if nothing changed!
I have the feeling that "/sys/devices/platform/leds-mt65xx/leds/button-backlight/brightness" is just where the information about the backlight status is written but not where it is set, at least here on my unit (that is, a Runbo X5 phone).
Any help would be greatly appreciated, I really want to turn those darn lights off at night.