Maybe I'll get some kind of answer here.
I have a Gateway Solo 1450 laptop.
Slackware 10.2/2.6.15 (Config available here
), running KDE (All default install, no 'current')
Intel i830 xorg.conf available here
ACPI active, no APM (Not supported by this hardware)
I need to brighten my backlight. In Windows, the 'Brightness' control worked, but not in KDE (This thing is WAY too dim to see outside in Slackware)