tree 3b5b5a394a5c4eade0a2dfa275d0152cba3f5590
parent 65bd97c6360a0e5190e393b84bc6b2d2029439a3
author Stefan Ott <stefan@ott.net> 1587590403 +0200
committer Alexander Couzens <lynxis@fe80.eu> 1590141128 +0000

mb/lenovo/t420s: Add support for ThinkLight

With this patch, the ThinkLight on the ThinkPad T420S can be controlled
through the OS.  The same change was done for the ThinkPad X200 in
b45912f4: mb/lenovo/x200: Add support for ThinkLight

After applying this patch, the light can be controlled like this:

    echo on >/proc/acpi/ibm/light
    echo off >/proc/acpi/ibm/light

Or through sysfs at /sys/class/leds/tpacpi::thinklight

Unfortunately I do not own a T420S to test this.

Change-Id: I245acf81b34abccf7bcb04126275ab8b154135d5
Signed-off-by: Stefan Ott <stefan@ott.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40715
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>