this happened to me only after upgrading from 12.10 to 13.04, it
suspends by itself even though i have disabled it in the power settings
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[SOLVED workaround]
using function keys to decrease the brightness works temporarily but
once you open the birghtness lock settings or the screen dims then
moving the pointer increases to fullest.
It looks like the fuction key settings is not linked to the birghtness
lock settings when I
