acpi_suspend_enter(9)

🎀 acpi_suspend_enter — actually enter a sleep state 💤

okay so this is a page from the Kernel API Manual, bestie. yes, that Kernel API Manual. we're doing kernel internals today and honestly? it's giving lowkey chaotic but we move 💅

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✨ NAME ✨

acpi_suspend_enter — actually enter a sleep state. like fr fr, that's the whole job. no cap.

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🌸 SYNOPSIS 🌸

int acpi_suspend_enter (suspend_state_t pm_state );

that's it. that's the whole signature. iconic of it, honestly 🫶

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🦋 ARGUMENTS 🦋

• pm_state — ignored 💀 like. literally ignored. not read, not checked, not consulted, not asked for its opinion. it's just there, vibing in the parameter list, main character energy for absolutely no reason 🙈

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⭐ DESCRIPTION ⭐

okay so real talk: this function flushes caches and goes to sleep. that's the tea 🍓

but here's where it gets messy — for STR, we have to call arch-specific assembly, which in turn calls acpi_enter_sleep_state. so the call chain is like... this function → architecture-specific assembly → acpi_enter_sleep_state. a whole relay race 🏃‍♀️💨

and yeah, the original author is very upfront about this: it's unfortunate, but it works. that's the whole mood. it's not pretty, nobody's proud of it, but it ships and it sleeps and we are NOT asking questions 💀

and then the sweetest little invitation in any manpage ever: "Please fix if you're feeling frisky." so like... if you're built different and you wanna redo this, go off king 👑 the maintainers are literally asking. that's an open callout. iykyk ✨

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💜 SEE ALSO 💜

bestie, the cross-reference section goes HARD. go read all of these, they're all connected, it's a whole cinematic universe 🌈

• the kernel file itself: ./drivers/acpi/sleep.c — that's where the magic (and the assembly) lives 🧚
• acpi_pm_freeze(9)
• acpi_pm_pre_suspend(9)
• __acpi_pm_prepare(9) — note the double underscore, she's special, don't @ her
• acpi_pm_prepare(9)
• acpi_pm_finish(9)
• acpi_pm_start(9)
• acpi_pm_end(9)
• acpi_suspend_begin(9)
• acpi_suspend_begin_old(9) — the old one. legacy. still invited to the party 🎀
• acpi_hibernation_begin_old(9) — also the old one. also invited.

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and that's the page, bestie 💖 this little gem lives in ./drivers/acpi and it's dated October 2026 — yes, 2026, we're manifesting the future, and honestly? she ate. go flush some caches. go to sleep. slay 😴✨