AMD Begins Plumbing APCI C4 Support in the Linux Kernel for Power Savings
5 hours ago
- #Linux Kernel
- #Power Management
- #AMD
- AMD engineers are working on ACPI C4 support for the Linux kernel to improve power savings on newer AMD Ryzen platforms.
- Initial patches for ACPI C4 support in the ACPI 'processor_idle' driver were sent to the Linux kernel mailing list.
- ACPI C4 enables VDD OFF, a requirement for s0i3 sleep state, which wasn't possible with only C3 support.
- Current Linux kernel support stops at ACPI C3, ignoring deeper states like C4, causing issues on some AMD hardware.
- Patches are under review to integrate ACPI C4 support, enhancing power management on modern AMD systems.