[Bug 75085] Backlight does not increase to maximum on Lenovo Yoga 2 Pro

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75085

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Check Xorg.0.log, it is probably using the acpi backlight interface instead.
How that maps to the raw value is defined by your firmware (and in some extreme
cases, the raw interface does not control the backlight at all).

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