[Intel-gfx] [RFC] [intel-gfx] :The backlight issue when KMS is used

Matthew Garrett mjg59 at srcf.ucam.org
Tue Apr 7 10:22:56 CEST 2009

On Tue, Apr 07, 2009 at 04:20:34PM +0800, Zhang Rui wrote:

> All subsystems can register a set of callbacks for backlight control in
> its own way, e.g. ACPI, platform driver, i915.
> And the backlight manager only exports one single I/F to users, like:
> ----|
>     |----brightness
>     |----actual_brightness
>     |----max_brightness
>     |----...
>     |----mode
> and it supports multiple modes, e.g.
> 1. generic ---ACPI
> 2. platform---platform drivers
> 3. legacy-----i915

This seems to be a lot of complexity for an uncommon case. Is there any 
real need to modify the mode at runtime? What happens if the platform 
driver gets loaded before i915?

Matthew Garrett | mjg59 at srcf.ucam.org

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