intel_cpu_f..._irq_handler(9)

💅 intel_cpu_fifo_underrun_irq_handler — the kernel API manual, but make it make sense

okay so bestie, you found a <hotpink>kernel API manual page</hotpink> and it's literally about handling a CPU fifo underrun interrupt. Stay with me, this is gonna slay ✨

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✨ NAME ✨

intel_cpu_fifo_underrun_irq_handler — handle CPU fifo underrun interrupt 🫶

🌸 SYNOPSIS 🌸

void intel_cpu_fifo_underrun_irq_handler (struct intel_display *display
, enum pipe pipe );

No cap, that's the whole signature. She's void, she takes two things, she does her thing 💖

🎀 ARGUMENTS 🎀

• display — the display device instance, aka the whole vibe we're operating on 🖥️
• pipe — the (CPU) pipe to set state for. yes gurl, a specific pipe. not all of them. just this one 💅

🦋 DESCRIPTION 🦋

So here's the tea ☕ — this bad boy handles a CPU fifo underrun interrupt. What does it actually do? Two things, and they're both iconic:

1. it generates an underrun warning into dmesg if underrun reporting is enabled 📝
2. then it disables the underrun interrupt to avoid an irq storm 🌪️

like, imagine the interrupt just kept firing forever. not on her watch. she shuts that down. main character energy honestly 👑

💀 fr fr note the "if underrun reporting is enabled" — the warning doesn't just spawn out of nowhere, it's conditional. respect the conditional.

🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/i915/display/intel_fifo_underrun.c — fifo underrun handling(9) 👀
• intel_set_cpu_fifo_underrun_reporting(9)
• intel_set_pch_fifo_underrun_reporting(9)
• intel_pch_fifo_underrun_irq_handler(9)
• intel_check_cpu_fifo_underruns(9)
• intel_check_pch_fifo_underruns(9)

the whole fifo underrun friend group, iykyk 🌈

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and that's the page!! 🧚 this one came from ./drivers/gpu/drm/i915/display, dated <purple>October 2026</purple>, and yeah — the footer still calls her intel_cpu_f..._irq_handler(9) because even manpage headers get tired 😭💜