How do I turn off backlight of keyboard?

Question

I've tried xset led 3, xset led off, xbacklight -set 00,

sudo find /sys/devices/platform/ -name leds returns nothing, so I couldn't try that.

sudo find /sys/devices -name leds returns /sys/devices/pci0000\:00/0000\:00\:1c.5/0000\:3f\:00.0/leds, but sudo echo '0' > /sys/devices/pci0000\:00/0000\:00\:1c.5/0000\:3f\:00.0/leds/phy0-led/brightness returns permission denied (yes, even with sudo).

sudo xmodmap -e 'add mod3 = Caps_Lock' returns error

X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 118 (X_SetModifierMapping) Value in failed request: 0x17 Serial number of failed request: 11 Current serial number in output stream: 11

So, I pretty much just copied and pasted a bunch of solutions from stack overflow, and so far nothing has worked, although, this, I believe should be a very simple thing to do.

I'm on a Lenovo Yoga 720, running ubuntu 18.10.

FYI: 18.10 is not yet on topic here on Ask Ubuntu - it's still in development. — Thomas Ward, Aug 20 '18 at 00:50
About `sudo echo > ...`, see [How do I use sudo to redirect output to a location I don't have permission to write to?](https://stackoverflow.com/q/82256/4518341) on Stack Overflow. — wjandrea, Aug 20 '18 at 00:59

score 7 · Answer 1 · edited Aug 20 '18 at 00:48

7

Press Fn + Space to turn off the backlight

edited Aug 20 '18 at 00:48

wjandrea

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answered Aug 20 '18 at 00:37

Zane Hitchcox

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I wish I had found this before I wasted 30 mins browsing all of Internet. I can't thank you enough stranger in the internet. – Chakradar Raju Aug 13 '20 at 06:34
I am looking for an alternative because this isn't working for me due to some reason. I think I was too hasty while pressing Fn + Space. My laptop was rebooting and I was still on the GRUB screen when I started hitting the combination. The backlit is turned ON continuously from then. – thewebjackal May 20 '21 at 05:18

score 0 · Answer 2 · edited Mar 21 '23 at 21:48

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Go to Settings → Power → Power Saving → Keyboard Brightness.

edited Mar 21 '23 at 21:48

BeastOfCaerbannog

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answered Mar 25 '22 at 14:01

user1581790

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How do I turn off backlight of keyboard?

2 Answers2