[Bug 93643] backlight: min value is always 0

[bugzilla-daemon at freedesktop.org]

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

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
As I said, the kernel scales the ABI to the hw min/max:

static inline u32 scale_user_to_hw(struct intel_connector *connector,
                                   u32 user_level, u32 user_max)
{
        struct intel_panel *panel = &connector->panel;

        return scale(user_level, 0, user_max,
                     panel->backlight.min, panel->backlight.max);
}

and uses the separate bl_power to actually turn the backlight on/off.

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