How to change the Brightness of lcd using debian os from olimex A20 board ?

[mailbriandavid]

Hi ,

I know how to set Backlight brightness by changing values in script.bin/script.fex file. Please let me know if there is any other methods in which i can change the brightness while running my OS as an application. As far as i know it uses PWM to change the brightness of my AUO 10 inch lcd display using my olimex A20 board. Please Help me with details i am newbie to linux.

Thanks in advance

[woodward]

Old thread, but I am curious about this. I don't know if this is what the op was asking for either. In release 1 or 2 (can't remember which) of olimex's debian build, you could set the lcd brightness by writing 0-251 to /sys/devices/virtual/disp/attr/lcd_bl.

# echo 251 > /sys/devices/virtual/disp/attr/lcd_bl

But in the new releases, this file no longer exists.

Does anyone know how to do this now?

Thank you