[Intel-gfx] [PATCH] i915: Add native backlight support

[Dave Airlie]

On Tue, Feb 23, 2010 at 3:05 AM, Matthew Garrett <mjg at redhat.com> wrote:
> Some machines do not provide a firmware or platform interface to backlight
> control, and so it's necessary to drive the hardware directly. Add support
> for a backlight driver to the drm. This will be flagged with the raw
> backlight type, allowing userspace to determine whether there is a more
> favourable backlight device available.
>

So there is one backlight, and a few different methods exposed to userspace
to use it? does the kernel not know which one it should expose? how does
userspace know any better?

Dave.