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Asus G46VW - Set Display and Keyboard Brightness in Ubuntu 12.10

After personalizing Ubuntu 12.10 to my liking, I found that Ubuntu has trouble remember my screen brightness settings, even though I set it through the "Brightness and Lock" options in "System Settings...". Ubuntu also recognizes the keyboard backlight. When you change it on the keyboard, Ubuntu pops up a dialog to show you the current setting. But like the display, it won't remember the setting once you reboot your computer; the screen and the keyboard always boots full bright.

The only way I was able to make these setting "permanent" from one boot session to another is to change the /etc/rc.local file with "sudo" permission. This is a file that gets executed by Linux at the end of its initialization sequence. I simply added a few lines to change the display and keyboard brightness settings after the computer has booted. I simply inserted the following lines into rc.local to get it to work.

# Change Display Brightness
echo 5 > /sys/class/backlight/acpi_video1/brightness

sleep 1

# Change Keyboard Brightness
echo 0 > /sys/devices/platform/asus-nb-wmi/leds/asus::kbd_backlight/brightness

For the display, the range is 0 to 10. I like it at 5. You can change the value to whatever you like between the range. The keyboard has a range of 0 to 3. I prefer an unlit keyboard, so I set it to 0.

Fri, 08 Mar 2013 05:26:22 +0300

Apparently, as I have just found out, the keybaord backlight setting in rc.local is not "permanent". When I close and open the lid on the notebook, the backlight is on again. On the other hand, If I use the Fn-F3 to turn off the backlight, the backlight stay off between lid opening and closing. So a better solution for the keyboard backlight is needed.

Fri, 08 Mar 2013 21:24:49 +0300

In addition, I found that if you enabled "Dim screen to save power" in the "Brightness and Lock" under "System Settigs...", when the screen brightness changes, it will trigger the keyboard light to be on again. It looks like it's really difficult to keep the keyboard backlight off through the command-line.

Sat, 16 Mar 2013 21:39:31 +0300

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