*** This bug is a duplicate of bug 1098216 ***
https://bugs.launchpad.net/bugs/1098216
This worked on roaring
sudo su
echo 40 > /sys/class/backlight/acpi_video0/brightness
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https://bugs.launchpad.net/bugs/1121951
Title:
Lenovo X1 Carbon: Backlight brightness keys don't work any more
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