2E Psionics used Wisdom, Charisma, and Intelligence. It makes sense mechanically (giving Intelligence another spellcasting class) and thematically.
WHOOPS!!! Suffered a severe case of the stupidsI think you mean Constitution, not Charisma.
About half of the powers were Wis, IIRC. Psychokinetic and Psychoportation were mostly Int, and the metamorphosis devotion (can't bring the name to mind) was mostly Con. Telekinetic were almost all Wis. Metapsionic was kind of a mish-mash, depending on what seemed to make sense.To expand on that slightly: PSPs (like spell points) were largely based off of Wisdom, and then individual powers were based off of different attributes. I remember most of the body-shaping powers like Ectoplasmic Form and Body Weaponry were based off of Constitution; I am not sure but I think telepathic powers were based off of Wisdom and psychokinetic powers like Disintegrate/Detonate were based off of Intelligence; I am not sure about clairvoyant powers or metapsionic like Empower.
I sure would like to see metapsionic powers again like Split Personality. They were one of the things that made psionics feel very distinct.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.