[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 #6 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #5)
> At any rate, that the ACPI firmware fails to set the maximum brightness is
> an issue in Lenovo's implementation.

It's debatable whether ACPI firmware is wrong in limiting the brightness (both
the maximum and the minimum non-off brightness), or our native backlight
interface is wrong in *not* limiting the brightness according to the ACPI
opregion.

Some backlights might not like having 100% duty cycle, they might exhibit
non-linear increase in power consumption, might have an impact on the longevity
of the backlight, etc.

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