Try giving the output of these two commands both when battery powered and when 
mains powered:
hal-device `hal-find-by-capability --capability ac_adapter`
hal-device `hal-find-by-capability --capability bettery`

This might contain some usable info.

** Changed in: kde-guidance (Ubuntu)
       Status: New => Incomplete

-- 
'Battery Powered' brightness slider also controls 'Mains Powered' settings when 
plugged in
https://bugs.launchpad.net/bugs/256448
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