without hald-addon-dell-backlight you can change brightness only through 
FN-keys, which work at a hardware level, (at least on many models).
thanks to hald-addon-dell-backlight, you can change brightness trough software, 
and get a nice screen notification when you use the FN-keys.
If you don't like it, probably there is a tricky way to deactivate it.

There are good reason for revising every software in existence, but bugs like 
this do not have any effect at all. Following and investigating bugs for the 
individual problems is the way to go. Abusing bug traking for else, just wastes 
developers and other people's time.
And I think they know how in bad shape libsmbios and hald-addon-dell-backlight 
are. Thanks for your interests though.

-- 
Revision of hald-addon-dell-backlight needed
https://bugs.launchpad.net/bugs/292778
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