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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?

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  • Check also /sys/devices/platform/sony-laptop/kbd_backlight_timeout where: 0(default)=10secs, 1=30secs, 2=60secs 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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