Inside of /proc/acpi/ibm, I see multiple devices provided by kernel module thinkpad_acpi,

x230:/proc/acpi/ibm$ ls
beep  bluetooth  cmos  driver  fan  hotkey  kbdlight  led  light  video  volume

Is there anyway though that I can change the status of the ThinkLight? If I echo 0 on > light, I can address and turn on the power light, but the rest of those [1-15] seem to register as invalid. What controls the Thinklight?

$ echo heartbeat | sudo tee /sys/class/leds/tpacpi::thinklight/trigger
tee: '/sys/class/leds/tpacpi::thinklight/trigger': Invalid argument

Interestingly enough this seems to follow this post, where the light can be turned off with,

echo 0 > /sys/class/leds/tpacpi\:\:thinklight/brightness 

but not turned on again

I'm using Debian Testing with Kernel 4.19, on a Lenovo x230.

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