Here's a strange issue:

On my Asus G75VW laptop, pretty much all the Fn keys work as expected, however screen brightness only works when first suspending (Fn+F1), and then coming out of suspend. As soon as I come out of suspend, the screen brightness is immediately lower, and only then am I able to adjust the brightness using Fn+F5/F6 (and, for that matter, from the System Settings > Brightness & Lock tool).

Any idea as to how to make it so that the screen brightness is always available to me, right after logging in, without having to suspend first? After all, that's how it should be...