To be honest, I've never understood the idea of backlight dimming in response to activity. If I'm using the computer, I want it to be at full (subject to preference/context) brightness. If I'm not using it, it might as well be off.
Perhaps there are more use cases for people who need to see what's on the screen without typing/mousing for long periods, but I would expect that to be niche.
Notes from the Montreal Linux Power Management Mini-Summit
Posted Aug 5, 2009 0:15 UTC (Wed) by foom (subscriber, #14868)
[Link]
The only reason I like backlight dimming is that it is less abrupt and disruptive than simply turning
off the screen. So if I am actually reading the screen but not interacting, the dim is a more subtle
signal to twiddle the mouse than the screen suddenly going blank.
That said, I prefer the behavior Gnome has these days: when you leave it alone, it starts slowing
fading to black over 10 seconds or so. That seems much better than having a drawn-out dimmed
screen period.