usb4_switch_set_sleep(9)

📦 version 7.3.1, in nixpkgs unstable

💤 usb4_switch_set_sleep(9) — the Kernel API Manual glow-up

okay so bestie, welcome to the usb4_switch_set_sleep(9) page 💖 it lives in the Kernel API Manual and honestly it's a little one-but-mighty situation. Let's get into it ✨

💫 NAME

usb4_switch_set_sleep — prepare the router to enter sleep 😴

Like, it's literally tucking your USB4 router into bed. Iconic behavior, no notes 🎀

🦋 SYNOPSIS

int usb4_switch_set_sleep (struct tb_switch *sw );

🌸 ARGUMENTS

  • sw — the USB4 router in question 🫶 that's the one getting the sleepy-time treatment.

🔥 DESCRIPTION

So here's the vibe: it sets the sleep bit for the router, then it waits. And waits. And keeps waiting until the router's sleep ready bit has been asserted 👑 that's the whole thing. No extra steps, no side quests, just set the bit and vibe-check the ready bit until it says yes 💅

ngl it's a blocking kind of energy — it does not return until that ready bit shows up. Plan accordingly, bestie 😭

⭐ RETURN

  • 0 on success ✨
  • a negative errno otherwise 💀

That's it. Zero means slay, negative means something went sideways.

🌈 SEE ALSO

okay this is the part where the friend group shows up en masse — the kernel file is ./drivers/thunderbolt/usb4.c and here's every single sibling function, no gatekeeping:

and that's the whole page, bestie 🧚 this little cutie came out of ./drivers/thunderbolt and it's stamped October 2026 — go forth and put your routers to sleep responsibly 💜✨

📦 where this page comes from