On another laptop, whose display brightness ACPI keys have worked for a while, there's a large icon that pops up on the Gnome desktop when I adjust the display brightness level. It sort of looks like a big lightbulb, with a slider underneath that scrolls horizontally, when I change the screen's brightness level.
On this laptop, the lightbulb does not pop up, only the display brightness changes. The only difference that I can think of is that the other one is running compiz (and the big lightbulb comes up as a semi-opaque overlay over the desktop), and this laptop's video hardware does not have accelerated support, so no compiz here. Would that be it -- just curious.
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