usb4_port_re...inbound_sbtx(9)

📦 version 7.3.1, in nixpkgs unstable

💅 usb4_port_re...inbound_sbtx(9)

okay so bestie, welcome to the Kernel API Manual ✨ — yes the manual name is literally in the title, we're fancy like that. this one's about usb4_port_retimer_set_inbound_sbtx, which sounds like a keyboard smash but is actually a whole vibe. let's get into it 🫶

🌸 NAME 🌸

usb4_port_retimer_set_inbound_sbtx — Enable sideband channel transactions. that's it, that's the whole job. iconic behavior honestly 👑

✨ SYNOPSIS ✨

int usb4_port_retimer_set_inbound_sbtx(struct tb_port *port, u8 index);

🎀 ARGUMENTS 🎀

  • port — a USB4 port. the main character of this story 🌈
  • index — the retimer index. which retimer we're talking to, iykyk 💅

🦋 DESCRIPTION 🦋

so what does it do? it enables sideband channel transactions on SBTX. no cap, that's the whole description 💀

and here's the tea: you can use this when the USB4 link does not go up — for example, if there is no device connected. like, nobody's home, but we still need the sideband channel chatting. so we enable it manually. lowkey kind of a slay 🔥

⭐ RETURN ⭐

  • 0 on success 🎉
  • negative errno otherwise 😭

like, pick a lane bestie. zero or sadness. there is no in between 🙈

💜 SEE ALSO 💜

this list is long — like, genuinely a whole group chat. don't skip it, every single one matters 🧚

Kernel file ./drivers/thunderbolt/usb4.c, plus:

that's the whole squad, go read them, they ate 💅✨

🌈 sign-off 🌈

and that's the page bestie! this little gem lives in ./drivers/thunderbolt, and it's stamped October 2026 — yes, future-dated, main character energy fr fr. see you in the next manpage 💖🎀🦋

📦 where this page comes from