It seems the _BCM is broken (_BCM is called when writing to
/sys/class/backlight/acpi_video0/brightness).
We will need BIOS to fix it (if it is still possible).
** Changed in: linux-lts-raring (Ubuntu)
Status: In Progress => Incomplete
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https://bugs.launchpad.net/bugs/1255014
Title:
[Lenovo V480] Unable to control the brightness from Max - Min
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