intel-pstate: Disable on-battery behaviour
Because of the way gnome-shell's animation framework is built, setting energy_performance_preference to balance_power has a visible impact on the smoothness of animations, as the CPU will clock down too quickly between frames, leading to the appearance of a performance regression.
Disable the on-battery behaviour until gnome-shell is fixed to avoid being accused of slowing systems down.
See https://gitlab.freedesktop.org/hadess/power-profiles-daemon/-/issues/28#note_862766
Closes: https://gitlab.freedesktop.org/hadess/power-profiles-daemon/-/issues/28
Edited by Bastien Nocera