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I've been using my Vaio VPCF121FX for over a year now, running Ubuntu 10.10 and then 11.04 and my backlight keyboard has always worked flawlessly. Until now, I just install Ubuntu 11.10 and this feature seems to be missing or forgotten by the developers.

Truth be told, I'm a late-at-night kinda typer so this is something I do use a lot in my day-to-day (or should I say nigth-to-night) laptop environment.

Does anyone know how to fix it?

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I summed up the suggestions for 12.04 here:… – medigeek Aug 3 '12 at 4:35
up vote 4 down vote accepted

Until a fix is released, enter this in a terminal:

echo 1 | sudo tee /sys/devices/platform/sony-laptop/kbd_backlight
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and how to turn it off back??? – user47060 Feb 19 '12 at 11:15
echo 0 instead of echo 1, I would suppose. – EboMike Feb 27 '12 at 5:48

Developing on EboMike's answer: you might want to update /etc/rc.local, adding the line

echo 1 | tee /sys/devices/platform/sony-laptop/kbd_backlight

just before exit 0 line. This way it is automatically executed when one reboots.

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protected by Community Aug 17 '12 at 23:10

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