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I have installed Lubuntu on my Sony Vaio and my keybaord backlight isn't working. I have tried a few things in command line but they don't appear to have worked.

I know that the backlight is still working because when the computer first turns on the backlight is on for around 30 seconds but then it switches off.

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I had this issue on my VAIO, you need to add a sony-laptop.conf file and an option to enable/disable the backlighting:

$ echo "options sony-laptop kbd_backlight=1" > /etc/modprobe.d/sony-laptop.conf

Then reboot and the backlight should be enabled.

I found the answer after much searching on medium.