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Sorry to bother everyone again. The issue is solved with the previous script, but for some reason the permission change to the /sys/.../brightness file reset after reboot. Any idea on how to make the change permanent so that I don't have to change each time I log in? Thanks!
I have that script set up under acpi. Use acpi -l, run tail -f on syslog, and you will see acpi events being logged. Use the Fn key combos and see if you get a brightness pair. BrightnessDown is of course the same except the math is different.
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