Worked on the linuxdeepin/dde-session-shell repository to address a stability issue affecting the login screen on multi-monitor setups, particularly with external 4K displays connected via docking stations. Focused on improving system UI reliability, the solution involved tuning the geometry reset timer and adding tolerance for incomplete display initialization, ensuring correct login screen positioning even when display setup was delayed. This C++ and Qt Framework-based fix enhanced the user experience by reducing anomalies during login and logout cycles. The work provided a more robust foundation for future display-related improvements, demonstrating careful attention to edge cases in system UI development and bug fixing.