intel_dmc_st...layed_vblank(9)

📦 version 7.3.1, in nixpkgs unstable

💖 NAME 💖

intel_dmc_start_pkgc_exit_at_start_of_undelayed_vblank — okay so this is literally the "start of PKG C-state exit" situation, bestie 🫶

This page lives in the Kernel API Manual, and yes the title up top got truncated to intel_dmc_st...layed_vblank(9) because apparently even manpage headers have a character limit 😭 but the full function name is right there in the NAME section, we move.

✨ SYNOPSIS ✨

void intel_dmc_start_pkgc_exit_at_start_of_undelayed_vblank (struct
intel_display *display , enum pipe pipe , bool enable );

That's the whole signature, no cap. Three args, returns nothing (void), does the thing. 💅

🌸 ARGUMENTS 🌸

  • display — the display instance, your main character struct ✨
  • pipe — which pipe's register is used to block, iykyk 🎀
  • enable — turn it on or off, that's the whole vibe (enable/disable) 🦋

🔥 DESCRIPTION 🔥

So here's the tea: this interface is the target for Wa_16025596647 usage. That's the workaround, that's the assignment, that's the whole reason this function exists, okay? 👑

Literally what it does is start the package C exit at the start of the undelayed vblank. That's it. That's the function. Genuinely iconic behaviour, no notes. ⭐

Lowkey important: the Wa_16025596647 bit is the reason this thing is here — if you're reading this because of that workaround, you're in the right place, bestie 💖

🦋 SEE ALSO 🦋

Kernel file ./drivers/gpu/drm/i915/display/intel_dmc.c — go read it, it ate 💀

All the sibling functions, all the family, we stan a whole module of them 🌈

Okay that's the page!! 🎀 It comes from ./drivers/gpu/drm/i915/display, dated October 2026, and the header was intel_dmc_st...layed_vblank(9) — yes the truncation is part of the lore, we respect it 🙈💜

📦 where this page comes from