--- title: Let Sleeping CPUs Lie — S0ix | daily.dev description: A deep dive into the history and mechanics of CPU power management, from early SMM and APM to modern ACPI S0ix (suspend-to-idle) states. Explains why S3 sleep... canonical: https://daily.dev/posts/let-sleeping-cpus-lie-s0ix-hzzzfsrxy twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Let Sleeping CPUs Lie — S0ix | daily.dev og:description: A deep dive into the history and mechanics of CPU power management, from early SMM and APM to modern ACPI S0ix (suspend-to-idle) states. Explains why S3 sleep... og:url: https://daily.dev/posts/let-sleeping-cpus-lie-s0ix-hzzzfsrxy og:image: https://api.daily.dev/og/posts/HzZzfsrxY.png og:image:alt: Let Sleeping CPUs Lie — S0ix og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Let Sleeping CPUs Lie — S0ix **[Lobsters](https://daily.dev/sources/lobsters)** · 17 min read · 0 upvotes · 0 comments ## Summary A deep dive into the history and mechanics of CPU power management, from early SMM and APM to modern ACPI S0ix (suspend-to-idle) states. Explains why S3 sleep is being phased out in favor of S0ix on modern laptops, how S0ix works (device D-states, CPU C-states, s2idle loop), AMD-specific SMU/PMFW requirements, and the hybrid S0ix+hibernate approach. Covers the current state of FreeBSD's S0ix and hibernate implementation, including what works, what's still in progress, and which AMD chip families are supported. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [AMD PMC Linux Driver Preps For Zen 6 CPUs](https://daily.dev/posts/amd-pmc-linux-driver-preps-for-zen-6-cpus-wncfnvnuw) · Phoronix · 0 upvotes · 0 comments - [Apple M1 Series SoCs To See ~1 Watt Power Savings With Linux 7.3](https://daily.dev/posts/apple-m1-series-socs-to-see-1-watt-power-savings-with-linux-7-3-eypoaq52o) · Phoronix · 0 upvotes · 0 comments - [GitHub - xoreaxeaxeax/smiiiiiiiiiiiiiiii: A very very very very very very very long interrupt](https://daily.dev/posts/github---xoreaxeaxeax-smiiiiiiiiiiiiiiii-a-very-very-very-very-very-very-very-long-interrupt-bhbwdsdis) · Hacker News · 4 upvotes · 0 comments - [The Secret Life of Your CPU: Exploring the Low Power Island in Android Bluetooth](https://daily.dev/posts/the-secret-life-of-your-cpu-exploring-the-low-power-island-in-android-bluetooth-xkj5fgva0) · freeCodeCamp · 3 upvotes · 0 comments - [Your motherboard has been running a second operating system this whole time, even when your PC is off](https://daily.dev/posts/your-motherboard-has-been-running-a-second-operating-system-this-whole-time-even-when-your-pc-is-of-aon1y9mfl) · XDA Developers · 0 upvotes · 0 comments --- Tags: [#linux](https://daily.dev/tags/linux) [View this post on daily.dev](https://daily.dev/posts/let-sleeping-cpus-lie-s0ix-hzzzfsrxy) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Let Sleeping CPUs Lie — S0ix","url":"https://daily.dev/posts/let-sleeping-cpus-lie-s0ix-hzzzfsrxy","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/let-sleeping-cpus-lie-s0ix-hzzzfsrxy"},"datePublished":"2026-04-16T12:52:26.968Z","dateModified":"2026-04-16T12:52:53.611Z","description":"A deep dive into the history and mechanics of CPU power management, from early SMM and APM to modern ACPI S0ix (suspend-to-idle) states. 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