In 592, the official He Tuo (), who had previously had disputes with Su, had a dispute with Su's son Su Kui (), and was angry that despite Su Kui's younger status, the other officials were largely supporting Su Kui due to Su Wei's power. He therefore submitted a petition to Emperor Wen accusing Su Wei of factionalism and nepotism. Emperor Wen had Yu and his son Yang Xiu the Prince of Shu investigate, and the accusations were found true.
He Tuo's disagreement with Su was exacerbated by his frustration that Su Kui, despite being younger, enjoyed widespread support from other officials due to Su Wei's power. He subsequently petitioned Emperor Wen, alleging that Su Wei was engaging in nepotism and factionalism.