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Linux 6.19 includes critical fixes for ATA link power management regressions that have affected systems for the past year. The fixes address issues with ATAPI devices and adapters with DUMMY ports that prevented systems from reaching low power states and blocked CPUs from entering low power C-states. Key problems resolved include ATA_QUIRK_NOLPM not being applied to ATAPI devices and improper reading of per-port areas for unimplemented ports, which violated AHCI specifications.

Linux 6.19 ATA Fixes Address Power Management Regression For The Past Year