[ltp] xbacklight = 1?

[Yves-Alexis Perez]

On Fri, Jun 13, 2008 at 09:53:34AM +0200, Arno Trautmann wrote:
> Hi,
>
> I hope, this is the right list for this question and you can give me a  
> hint; it’s about xbacklight:
>
> I have a X61s, Arch Linux, using xbacklight. When I don’t use the  
> machine for some minutes, the screen turns black. ok, great so far.
> Returning to the keyboard, the screen turns bright, wonderful. But  
> mostly it is going to brightnes level 100. Good, so I do a
>
> xbacklight = 0
>
> because I’m fine with the remaining brightnes at level 0. But if I enter  
> this, the screen doesn‘t change at all, but stays bright. If I type a
>
> xbacklight = 1,
>
> it turns to level 1 and is dark. Now I can put it back to 100, and then  
> putting it to 0 succeeds… this ist quite a strange thing I really would  
> like to understand. Some kind of bug – but where? xbacklight, hardware  
> or anything else? It’s not a serious problem, just a bit annoying.
>
I have the same thing on a T61 running debian sid. I think the problem
is in the Xorg intel driver, which doesn't read the firmware backlight
value before setting it, or something like that.

Cheers,
-- 
Yves-Alexis