amdgpu_dm_connector_detect(9)

💅 amdgpu_dm_connector_detect(9) — from the Kernel API Manual, bestie 🎀

okay so real quick, the manual name is amdgpu_dm_connector_detect(9) and this is the Kernel API Manual, and honestly? this one's a little baddie. it's the function that answers the most iconic question in all of display land: is something actually plugged in or not 💖

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✨ NAME ✨

amdgpu_dm_connector_detect — literally just detecting whether a DRM connector is connected to a display, no cap 🖥️✨

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🌸 SYNOPSIS 🌸

enum drm_connector_status amdgpu_dm_connector_detect (struct
drm_connector *connector , bool force );

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🎀 ARGUMENTS 🎀

• connector — the DRM connector we're checking, bestie. we convert it to an amdgpu_dm_connector so we can read the DC link and state. it's giving "let me get a better look at you" 👀
• force — if true, do a full detect again. this one gets used even when a lighter check would normally be the move, specifically to avoid flicker. highkey a glow-up for your eyeballs ✨

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💖 DESCRIPTION 💖

so a connector counts as connected when it has a sink that is not NULL. that's the whole vibe check, fr fr 🫶

for connectors that support HPD (hotplug detection), the connection situation is handled in the HPD interrupt — she's got people for that 💅

for connectors that may not support HPD, like analog connectors, DRM will call this function repeatedly to poll them. yes, repeatedly. she's persistent and we love her for it 🕵️‍♀️

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🌈 NOTES 🌈

1. this interface is NOT called in context of HPD irq. read that again. not. 🚫
2. this interface *is called* in context of user-mode ioctl. which makes it a bad place for *any* MST-related activity. like, do not. seriously. 🫠

bestie the italics in note 2 are not decorative, they are a whole warning 🚨

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⭐ RETURN ⭐

the connector status — which is one of: connected, disconnected, or unknown. that's it, that's the tea 🍓

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_connector.c
• FreeSync Video(9)
• amdgpu_dm_connector_poll(9)
• amdgpu_dm_update_freesync_caps(9)

go read those next, iykyk 📚👑

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and that's the whole page! source/version: ./drivers/gpu/drm/amd/display/..., dated October 2026, filed under amdgpu_dm_connector_detect(9). periodt. 💜🌙