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Learn to debug complex CPU power management issues on ARM System-on-Chip (SoC) platforms through this 45-minute conference talk from Linux Foundation experts. Explore the intricacies of Linux CPUIdle framework and suspend-to-idle (s2idle) functionality, focusing on how modern ARM SoCs manage deep idle states that can shut down CPUs, local timers, interrupt controllers, and peripherals. Discover why these power management transitions sometimes result in entry-exit failures, scheduling delays, and system hangs, and understand the complex interactions between the kernel, platform-specific firmware, and dedicated hardware that enable low-power modes. Master debugging techniques for power management issues where traditional debug methods may be unavailable, gaining insights into CPUIdle internals, PSCI firmware interactions, and wakeup timer behavior. Through real-world case studies presented by Dhruva Gole from Texas Instruments and Kevin Hilman from BayLibre, acquire practical skills for tracing idle state transitions, identifying CPU wakeup failures, understanding ARM Trusted Firmware's PSCI framework internals, and applying effective debugging strategies to ensure proper CPUIdle framework operation on ARM Linux systems.
