intel_check_...fo_underruns(9)

💅 intel_check_pch_fifo_underruns(9) 💅

okay so real talk, bestie — this is a page straight outta the Kernel API Manual, section 9, and it's all about that intel_check_pch_fifo_underruns life. literally the whole page, no crumbs left behind 🫶

---

✨ NAME ✨

intel_check_pch_fifo_underruns — check for PCH fifo underruns immediately, no waiting around, no "let me get back to you on that" energy 💅

---

🌸 SYNOPSIS 🌸

void intel_check_pch_fifo_underruns(struct intel_display *display);

that's it, that's the whole signature, she's compact and she knows it ✨

---

🎀 ARGUMENTS 🎀

• display — the display device instance. like, the actual display thing you're poking at. your main character struct 💖

---

🦋 DESCRIPTION 🦋

So here's the vibe: this function checks for PCH fifo underruns immediately. Not later, not on some lazy deferred schedule — right now, on the spot, no cap ⚡

And why do we care? Because it's genuinely useful on CPT/PPT, where the shared error interrupt may have been disabled 😭 and so — and this is the important bit — PCH fifo underruns won't necessarily raise an interrupt.

🚨 read that again bestie: if the interrupt is off, the underrun can just... happen. silently. no alarm, no notification, nothing. that's literally why this function exists — go look, manually, right this second.

---

🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/i915/display/intel_fifo_underrun.c — the whole implementation lives here, go read it, it's giving lore 👑
• fifo underrun handling(9)
• intel_set_cpu_fifo_underrun_reporting(9)
• intel_set_pch_fifo_underrun_reporting(9)
• intel_cpu_fifo_underrun_irq_handler(9)
• intel_pch_fifo_underrun_irq_handler(9)
• intel_check_cpu_fifo_underruns(9)

that's the whole friend group, they all hang out together 🌈

---

and that's the page!! source/version check real quick: this came out of ./drivers/gpu/drm/i915/display, dated October 2026, manual label intel_check_...fo_underruns(9) — iconic, no notes, periodt 💜✨🎀