Why the cpu performance value to use when on AC is 85 by default?



Hello Everyone:

I've a user of GNOME, I wonder that why the cpu performance value to use
when on AC power is 85 by default?\
I found the settings in Configuration Editor,
/apps/gnome-power-manager/cpufreq/performance_ac is set to 85 by default.
Someone set the value to 100, the performance is up, and someone have no
effect.
I want to know why.

Thanks.

TualatriX
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