Laptop Panel brightness control

[Crispin Flowerday]

On Fri, 2006-05-12 at 11:01 -0400, David Zeuthen wrote:
> On Tue, 2006-05-09 at 18:58 +0100, Crispin Flowerday wrote:
> > So, we really could do with a HAL property to differentiate the 2 cases,
> > how about "laptop_panel.brightness_in_hardware"?
> 
> Ugh, the joys of borken hardware. 
> 
> Yes, a property like laptop_panel.brightness_in_hardware, might be a
> good idea. The docs should say that agents such as gnome-power-manager
> (or whatever) should, if laptop_panel.brightness_in_hardware = TRUE,
> refrain from doing SetBrightness(GetBrightness() + delta). Richard?

The critical case, is that agents should avoid calling SetBrightness()
as a result of a brightness-up or brightness-down case, that case can
cause feedback loops between the hardware and software causing the cycle
of brightness up, then down.

Crispin