[Bug 93643] backlight: min value is always 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93643

--- Comment #6 from Jani Nikula <jani.nikula at intel.com> ---
The backlight sysfs ABI does not define whether 0 means off or not. It means
min brightness, which *may* be off. The ABI was defined for hardware which
might not be able to switch the backlight off. The minimum also depends on the
backlight hardware.

>From ABI perspective, *both* behaviors are correct.

Also for drm/i915, this depends on the panel and whether it's LVDS or eDP.

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