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G3 iBook LCD brightness in X under kernel 2.4.25 and 2.6.8

I'm trying to migrate from a 2.4 to a 2.6 kernel, but I have one last problem 
keeping me with 2.4.25. There's a problem with adjusting screen brightness 
under X (4.3.0.dfsg.1-8).

I'm running pbbuttonsd 0.6.6-2 with gtkpbbuttons 0.6.4-3 (which are tools that 
enable the LCD to be dimmed and brightened with keyboard pressed). When I'm 
running the Debian kernel-image 2.4.25-8 and I press the brightness up or 
down keys, I get the on-screen indication from gtkpbbuttons and the LCD dims 
or brightens as expected in both X and on the console. However, when I boot 
into kernel-image 2.6.8-6 or 2.6.9-1 and press the brightness keys, I get the 
on-screen indication in X, but the LCD doesn't change brightness. However, if 
I switch to a VT with a console, the brightness changes to what I tried to 
change it to. Also, pressing the brightness buttons works fine when I press 
them while in the console.

My video card is a Mach64, and I'm using the 'ati' driver for X. One guess I 
have is that in 2.6, lots more things are built as kernel modules. I'd like 
to try build any needed video stuff in, but I don't know what it could be. 
Does anyone here have an idea what controls screen brightness in X?

The reason this is important for me is that the LCD is not dimmed when I close 
the lid for sleep, which kind of ruins the point of sleep.

Does anyone have an idea of what else I need to do to get screen dimming to 
work under X with Linux 2.6?


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