Vaisesika Sūtra 1.1.16

द्रव्याश्रय्यगुणवान् संयोगविभागेष्वकारणमनपेक्ष इति गुणलक्षणम् ॥१६॥

Qualities take shelter in dependent combination and disjunction of substances, uncaused by the mind. This is the characteristics of qualities (guna).

"uncaused by the mind" - indicates a reality that is independent of the mind.