Sorry, I accidentally sent the email, too early. I was about to point out,
that somebody seems to have found a way to turn the ThinkLight on, on
modern Thinkpads, through EC:
https://www.reddit.com/r/thinkpad/comments/5f87sg/hint_blinking_the_thinklight_with_software_on_new/
Perhaps, this is a me
On my X230 and X250, the ThinkLight can only be turned off, but not on,
though /sys/class/leds/tpacpi::think/birghtness, /proc/acpi/ibm/light
and /proc/acpi/ibm/cmos. Other users report the same problem (also
mentioning the models X1 Carbon, T430, T530 and W530):
http://linux-thinkpad.10952.n7.nab
