intel_pch_f..._irq_handler(9)

💅 intel_pch_fifo_underrun_irq_handler(9) 💅

okay so bestie, welcome to the Kernel API Manual — no cap, this is the glow-up edition of intel_pch_f..._irq_handler(9). sit down, grab a strawberry 🍓, we're talking about the PCH fifo underrun interrupt and honestly it's kind of iconic.

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✨ NAME ✨

intel_pch_fifo_underrun_irq_handler — literally handles the PCH fifo underrun interrupt 🎀

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🦋 SYNOPSIS 🦋

void intel_pch_fifo_underrun_irq_handler (struct intel_display *display
, enum pipe pch_transcoder );

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🌸 ARGUMENTS 🌸

• display — the display device instance, your main character 🫶
• pch_transcoder — the PCH transcoder ✨ (and yes, this is the same as pipe on IVB and older — iykyk)

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👑 DESCRIPTION 👑

so here's the vibe: this function handles a PCH fifo underrun interrupt. what does it do though? it generates an underrun warning into dmesg if underrun reporting is enabled, and then — and this is the important part, bestie — it disables the underrun interrupt so you don't get an irq storm. 💀

like, imagine getting spammed with interrupts forever. not the vibe. so we shut it off. periodt.

no cap, that "disables the underrun interrupt" part is the whole point — it's the anti-irq-storm slay. 🔥

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🧚 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_cpu_fifo_underrun_irq_handler(9)
• intel_check_cpu_fifo_underruns(9)
• intel_check_pch_fifo_underruns(9)

all of these are giving "read me next" energy, ngl 🌈

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aaaand that's the page, bestie 🫶 this little masterpiece lives in ./drivers/gpu/drm/i915/display, it's dated October 2026, and it's filed under intel_pch_f..._irq_handler(9). go forth and have zero irq storms. 💜🎀✨