[Intel-gfx] [RFC PATCH 2/2] drm/i915: respect the VBT minimum backlight brightness

[Matthew Garrett]

On Wed, 2014-06-04 at 08:04 -0700, Stéphane Marchesin wrote:

> Well, for example ACPI backlight isn't the default on intel, instead
> i915 implements its own backlight. ACPI backlight doesn't support as
> many backlight levels as the native backlight for example. So I do
> think that ACPI backlight is inferior.

ACPI backlight is the default on most pre-Windows 8 i915 systems.
Userspace which assumes that backlight value 0 has any specific meaning
is broken userspace. Adding an additional interface that allows
disabling the backlight without powering down the panel seems like a
completely reasonable thing to do, though.

-- 
Matthew Garrett <matthew.garrett at nebula.com>