drm_dp_mst_..._queue_probe(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_dp_mst_..._queue_probe(9) — aka the Kernel API Manual, bestie ✨

okay so you found the drm_dp_mst_..._queue_probe(9) page in the Kernel API Manual and you're like "what is this even" — don't worry, I gotchu 🫶 it's way less scary than the name looks, promise.

🌸 NAME 🌸

drm_dp_mst_topology_queue_probe — literally just queueing up a topology probe 🎀

✨ SYNOPSIS ✨

void drm_dp_mst_topology_queue_probe (struct drm_dp_mst_topology_mgr
*mgr );

yes that's the whole thing, she's a void, she takes one arg, she does not return anything to you 💅

🦋 ARGUMENTS 🦋

  • mgr — the manager you wanna probe. that's it. that's the whole vibe check 🎀

🔥 DESCRIPTION 🔥

So basically this queues a work item to probe the MST topology — it's giving "hey go resync yourself" energy ✨

Now here's the part where you gotta pay attention bestie, no cap: drivers should call this only to sync the topology's HW->SW state after the MST link's parameters have changed in a way the state could've become out-of-sync. That's the only reason, okay? 👑

When is that actually the case? The example given: when the link rate between the source and the first downstream branch device has switched between UHBR and non-UHBR rates. That's the moment, that's the main character moment 🦋

And except for those cases — for instance when a sink gets plugged/unplugged to a port — you don't need to do anything, because the SW state will get updated automatically via MST UP message notifications. Automatic. Free. Slay 💅 so don't go calling this when you don't need it, the topology's already handling itself 🙈

💜 SEE ALSO 💜

okay this list is long and honestly iconic for it, here's everyone invited to the group chat 🌈

like I said. everyone. the whole friend group 💀 but they're all (9) so yk they're legit 🧚

and that's the page!! mwah 💖 this one came out of ./drivers/gpu/drm/display and it's dated October 2026, so if you're reading this in a timeline where that's already happened — hi, hope the topology is synced 🫶

📦 where this page comes from