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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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    Let us know the things you've tried. Have you looked into /sys/devices/platform/sony-laptop? – Stephen Boston Jun 5 at 2:42
  • I would first check the documentation for the laptop from Sony to see if there is a hardware switch. That is usually the case for keyboard backlights. Since the implementation of keyboard backlights is not universal, if it has to be controlled by software in Windows you may not be able to control it without software written for Linux from Sony, unless someone has written a community driver or software for that device. – Nmath Jun 5 at 2:46
  • Sometimes you can install lm-sensors and then run sudo sensors-detect and follow the instructions. Some people have reported the backlights working after performing this procedure. Also, see this other related post and please tell us if any of these solutions have worked for you. Thanks! askubuntu.com/questions/171384/… – mchid Jun 5 at 3:29
  • also: askubuntu.com/questions/68423/… – mchid Jun 5 at 4:05
  • You haven't told us your release of Lubuntu (as I have Lubuntu on my vaio and I could look); the keyboard backlight worked for 18.10, 19.04 and I could look for you; alas I don't know if you're using older LXDE or modern LXQt). My keyboard light goes off too after a time, but turns back on whenever I hit a key. Does this happen when you use the keyboard? or is it only on for 30 seconds after boot (then remains off)? – guiverc Jun 5 at 6:42
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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.

  • I'm having the same issue, and would appreciate some assistance. – stroudmw Oct 25 at 6:34
  • What can I help you with? Have you added the above mentioned line to sony-laptop.conf ? – aircooledcafe Oct 27 at 19:42
  • yes, I did. It hasn't helped. – stroudmw Nov 4 at 6:27

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