Linux 7.4 improves PCI bridge power-down during hibernation

Linux 7.4 aligns the PCIe-bridge hibernation power-off path with suspend handling, allowing bridges with downstream devices to enter a low-power state when the platform supports it. Previously, bridges with active children could remain in D0 during hibernation, which could prevent systems—especially designs with discrete GPUs—from meeting regional energy-certification criteria.

This is a focused power-management fix, not a broad PCI performance change. Phoronix exposed no readable discussion for the story, so this summary makes no claims about reader reactions.