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 method that could also be considered for the thinkpad_acpii driver.
On Wed, Apr 19, 2017 at 2:24 PM, Sebastian Noack <sebastian.noack@xxxxxxxxx> wrote:
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): It seems something changed in the BIOS/ACPI when they added support for keyboard backlight.
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