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After reading dozens of other posts and nothing seems to work, I've located "keyboard backlight" in the /sys/module/sony_laptop/parameters/ module but don't know how to get it to switch on.

I've downloaded the Sony VAIO control center for Linux here but don't know how to use it to enable the keyboard backlight. Can anyone help with that please?

I feel so close yet so far away. I've been trying to solve this problem for many days and hours so any help would be much appreciated.

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  • Changing kbd_backlight file works but the problem remains after rebooting
    – gocen
    Jun 11, 2020 at 22:04
  • Yes, my experience exactly.
    – Alan
    Jun 12, 2020 at 23:36

2 Answers 2

Reset to default
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I found it. Open nautilus first with

sudo nautilus

Navigate to

/sys/devices/platform/sony-laptop

There is a file called kbd_backlight

Open it, there should be a 0 or a -1. Edit it to just leave a 1. Done. I replace for a 0 and save, backlight instantly turns off, change again to 1 and instantly on. No reboot needed. Hope it helps.

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  • it's easier to use the terminal for that ;)
    – damadam
    Nov 27, 2019 at 13:00
  • Ok. Go ahead and post the fix entirely for terminal. I proposed it this way, plain and simple
    – NotNamed420
    Nov 28, 2019 at 19:24
  • I tried that but when I changed the value, I got an error message that wouldn't let me save: Could not save the file “/sys/module/sony_laptop/parameters/kbd_backlight”. You do not have the permissions necessary to save the file. Please check that you typed the location correctly and try again.
    – Alan
    Nov 29, 2019 at 22:20
  • I entered the correct password after entering sudo nautilus then got the above.
    – Alan
    Nov 30, 2019 at 2:37
  • sudo nano kdb_backlight to quickly edit the file with super root permissions
    – gccallie
    Mar 7, 2021 at 18:31
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a simpler way to do NotNamed420's solution in a single line would be to run:

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