How can I enable keyboard backlight on Sony Vaio pro with Ubuntu 13.10?

I have already tried setting the bit in /sys/devices/platform/sony-laptop/kbd_backlight with

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

and when saving the file I can see the bit has changed, but my keyboard still stays off.

Has anyone else had this problem, and found a way to fix this?

1 Answer 1


Check also /sys/devices/platform/sony-laptop/kbd_backlight_timeout where:

  • 0(default) = 10 secs
  • 1 = 30 secs,
  • 2 = 60 secs and
  • 3 = unlimited.

Or possibly use a /etc/modprobe.d/sony-laptop.conf file with:

options sony-laptop kbd_backlight=2

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