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I'm using a Lenovo ThinkPad X200s with Lubuntu. Yesterday I updated my system to Version 19.04, but the ThinkLight won't work any more using the short cut.

Trying to set it manually by changing to

/sys/devices/platform/thinkpad_acpi/leds/tpacpi::thinklight

and setting echo 255 | sudo tee brightness won't change anything. (But works).

Do I have to set anything new? Thank you

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