dc_dmub_srv_..._power_state(9)

📦 version 7.3.1, in nixpkgs unstable

✨ NAME ✨

dc_dmub_srv_notify_fw_dc_power_state — okay so this one literally notifies the firmware of the DC power state 💅 that's the whole job. It's page dc_dmub_srv_..._power_state(9) out of the Kernel API Manual, and yes bestie, section 9, we're in kernel land now 🫶

🌸 SYNOPSIS 🌸

void dc_dmub_srv_notify_fw_dc_power_state (struct dc_dmub_srv
*dc_dmub_srv , enum dc_acpi_cm_power_state power_state );

🎀 ARGUMENTS 🎀

  • dc_dmub_srv — -- undescribed -- 😭 the docs genuinely just left this one blank, no cap. I'm not gonna make something up for you, that's not the vibe.
  • power_state — -- undescribed -- 🙈 also blank in the official listing. The DESCRIPTION section does spill a little tea about both of these though, so keep reading 👀

🦋 DESCRIPTION 🦋

So here's the thing that makes this function different from dc_dmub_srv_set_power_state: this one actually needs to access hardware in order to message DMCUB about the state transition 🔥 like, it's not just bookkeeping, it's out here touching real HW.

Timing matters, bestie — it should come after the D0 exit and before the D3 set power state ⭐ get that order wrong and, well, the manpage doesn't say, but the manpage also isn't gonna hold your hand on that one 💀

And for the record, here's the lowkey parameter recap that's tucked into the description:

  • dc_dmub_srv — the DC DMUB service pointer
  • power_state — the DC power state

👑 SEE ALSO 👑

The kernel file that started it all:

./drivers/gpu/drm/amd/display/dc/dc_dmub_srv.h

And the whole friend group 🫶:

ngl there's no RETURN VALUE section and no error list here, so this one's giving "void and unbothered" energy 💜 don't go looking for an exit status, it's not hiding anywhere, promise 🤞

Okay that's the whole page, mwah 💋 it lives at ./drivers/gpu/drm/amd/display/dc, dated October 2026, and it's filed under dc_dmub_srv_..._power_state(9) — go be a main character with your power states, bestie 🌈✨🍓

📦 where this page comes from