System suspend failure due to CPU Cstate (PC2) blocked by SATA AHCI mode and secure boot disabled in BIOS

Issue

• The system does not successfully enter suspend mode as expected.
• System fails to enter suspend state with SATA AHCI mode and secure boot disabled.
• System fails to enter suspend state with CPU Stuck in PC2 Cstate.
• AHCI controller blocks CPU cstate (stuck on PC2) during system suspend.