devfreq_suspend(9)

💤 devfreq_suspend — the kernel API manual, bestie edition

Okay so real quick, this is devfreq_suspend(9) from the Kernel API Manual — yes that's the whole title, and yes we're gonna get into it 💅

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✨ NAME ✨

devfreq_suspend — the function that puts your devfreq governors and their devices to sleep 😴 like it's tucking them in for a system-wide nap

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🦋 SYNOPSIS 🦋

void devfreq_suspend (void );

That's it. That's the whole signature. Void in, void out, no drama, no return value, no cap.

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🎀 ARGUMENTS 🎀

• void — literally no arguments. She takes nothing. She gives everything. Main character energy fr fr 👑

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🌸 DESCRIPTION 🌸

So here's the vibe: devfreq_suspend gets called during system-wide Suspend/Hibernate cycles 🔥 and its whole job is suspending the governors and the devices — but like, preserving the state for resume. Not deleting it. Not forgetting it. Keeping it safe for later, like a good bestie holding your iced coffee 🫶

Why does any of this matter, you ask? Because on some platforms the devfreq device must have that precise state (we're talking frequency here, the exact one) after resume, otherwise it can't provide a fully operating setup. So like... if the frequency comes back wrong, the whole thing is giving broken. 🙈

So yeah. She suspends. She preserves. She sets you up for a clean resume. Iconic behaviour, honestly. ⭐

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🧚 SEE ALSO 🧚

The kernel file lives at ./drivers/devfreq/devfreq.c — go say hi 👋 and then check out the whole friend group:

• find_device_devfreq(9)
• devfreq_get_freq_range(9)
• devfreq_get_freq_level(9)
• devfreq_update_status(9)
• find_devfreq_governor(9)
• try_then_request_governor(9)
• devfreq_update_target(9)
• update_devfreq(9)
• devfreq_monitor(9)
• devfreq_monitor_start(9)
• devfreq_monitor_stop(9)
• devfreq_monitor_suspend(9)
• devfreq_monitor_resume(9)
• devfreq_update_interval(9)
• devfreq_notifier_call(9)
• qos_notifier_call(9)
• qos_min_notifier_call(9)
• qos_max_notifier_call(9)
• devfreq_dev_release(9)
• devfreq_add_device(9)
• devfreq_remove_device(9)
• devm_devfreq_add_device(9)
• devm_devfreq_remove_device(9)
• devfreq_suspend_device(9)
• devfreq_resume_device(9)
• devfreq_resume(9)
• devfreq_add_governor(9)
• devm_devfreq_add_governor(9)
• devfreq_remove_governor(9)
• devfreq_summary_show(9)
• devfreq_recommended_opp(9)
• devfreq_register_opp_notifier(9)
• devfreq_unregister_opp_notifier(9)
• devm_devfreq_register_opp_notifier(9)
• devm_devfreq_unregister_opp_notifier(9)
• devfreq_register_notifier(9)
• devm_devfreq_register_notifier(9)
• devm_devfreq_unregister_notifier(9)

Like, the whole squad. Go read them all, iykyk 💖

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💀 no warnings in here, she's a clean little void function, but remember the state-preservation thing is load-bearing — don't go messing with that

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And that's the page!! 🎉 This one dropped from ./drivers/devfreq, October 2026, and it's officially a wrap. Slay, stay suspended, see you at resume 💜🌈✨