I can confirm that. I've just upgraded from gutsy to hardy on my dell inspirion 
1520. But I'm using kubuntu (it's guidance-power-manager in kde).
When I'm in kde, pressing Fn+up/down skips one brightness level. And I can see 
2 popups showing brightness level (one under another).
In console everything works fine. 
I can set any level with 'echo [something] > 
/proc/acpi/video/VID/LCD/brightness'. I can set any level in 
guidance-power-manager. I can even increase/decrease brightness level by one 
with 'dcop guidance power-manager brightnessDown/brightnessUp'

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Screen brightness double level changes
https://bugs.launchpad.net/bugs/207473
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