Similar issue here on a Acer Travelmate C110 with Intel 855GM - brightness keys 
(FN-left/right) work without a proble until first suspend/resume, then 
brightness cannot be changed anymore and remains 100%.
- xev does never give output on those keys
- tried various grub parameters regarding acpi (acpi=off, nolapic, 
acpi_osi=Windows/Linux,...)
- setting brightness via terminal "sudo echo -n <value>| sudo tee  
/proc/acpi/video/*/LCD/brightness" does not work anymore

No problems with Ubuntu Gutsy (if I remember right), same problem with recent 
Arch Linux :(
Please let me know about debug information output needed.

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Putting laptop to suspend breaks the brightness control
https://bugs.launchpad.net/bugs/351443
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