amdgpu_dm_hd...ebounce_work(9)

💅 amdgpu_dm_hdmi_hpd_debounce_work 🎀

okay so bestie, we're in the Kernel API Manual, section 9 — yes, the big-girl kernel section, come on in, the water's fine ✨

This one's the HDMI HPD debounce delay, measured in milliseconds. Real talk: when an HDMI display toggles HPD (like, say, during power save transitions — you know the vibe 😴), this delay is literally the amount of time the driver waits before it goes and processes that HPD event. It's giving "chill, let me think for a sec" energy 🧚

And why do we care? Because this is how the driver tells apart two very different situations:

• a physical unplug — that's when the toggle is greater than hdmi_hpd_debounce_delay 🔌💀
• a spontaneous RX HPD toggle — that's when it's less than hdmi_hpd_debounce_delay 🌀

If the toggle comes in less than this delay, the driver goes ahead and compares the sink capabilities, and it'll permit a hotplug event if they changed. slay. that's the whole check 👑

As for the default: it's 1500ms, and no, that number wasn't just picked out of thin air 🙈 it was chosen based on experimental testing with various monitors that exhibit spontaneous HPD toggling behavior. so like, actual science was done. respect it 💅

✨ SEE ALSO ✨

go check out the kernel file ./drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c — it's the main character of this whole friend group 🫶 and then these icons right here:

• overview(9)
• struct amdgpu_dm_irq_handler_data(9)
• dm_irq_work_func(9)
• amdgpu_dm_irq_register_interrupt(9)
• amdgpu_dm_irq_unregister_interrupt(9)
• amdgpu_dm_irq_init(9)
• amdgpu_dm_irq_fini(9)
• amdgpu_dm_irq_handler(9)
• amdgpu_dm_hpd_init(9)
• amdgpu_dm_hpd_fini(9)
• dmub_hpd_callback(9)
• dmub_hpd_sense_callback(9)
• dm_pflip_high_irq(9)
• dm_crtc_high_irq_handler(9)
• dm_crtc_high_irq(9)
• dm_dcn_vertical_interrupt0_high_irq(9)
• dm_dmub_outbox1_low_irq(9)

okay that's the whole page, mwah 💋 it came from ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — so jot that down, and remember the page name is amdgpu_dm_hd...ebounce_work(9) if you ever gotta cite your sources. bye bestie, go debounce something 🌸🦋