Keyboard backlight on Sony Vaio with Linuxhttp://shiba89.wordpress.com/2012/09/07/keyboard-backlight-on-vpcs11e7e-with-ubuntu-12-04/
Since some Linux kernel version, the sony_laptop module has been able to manage natively Vaio’s keyboard backlight, turning it on/off and setting its timeout delay.
echo 1 | sudo tee /sys/devices/platform/sony-laptop/kbd_backlight
--> 0 = off, 1 = on
echo 1 | sudo tee /sys/devices/platform/sony-laptop/kbd_backlight_timeout
--> 0 = 10 seconds, 1 = 30 seconds, 2 = 60 seconds, 3 = Always on