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A comment on Show HN: A browser extension that notifies you about new messages using LEDs. Parent comment

Re:Show HN: A browser extension that notifies you about new ... by Johnnynator on Friday May 12, 2017 @02:16AM (#14321796)
I will check if I can it get running on my old Acer, at leat I have a ton of unused LED on it.

And can't one use the background light of a keyboard as a notification light?

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Re:Show HN: A browser extension that notifies you about new ... by wallunit on Friday May 12, 2017 @02:58AM (#14321966)
Awesome, I'm looking forward to see whether it is working on your Acer laptop.

You can use anything that is exposed by the Linux kernel under /sys/class/leds/*. This includes the keyboard backlight of ThinkPads. As for other vendors, it depends on whether the keyboard backlight (or any other LED) can be controlled in software, and if so whether it is supported by any kernel driver.

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Re:Show HN: A browser extension that notifies you about new ... by Johnnynator on Friday May 12, 2017 @08:17AM (#14323296)
:( literally every light can't be toggled, except the usual stuff like numlock or capslock.
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