drm_detect_hdmi_monitor(9)

💖 drm_detect_hdmi_monitor(9) 💖

okay so this is a page from the Kernel API Manual, and bestie, it is so much shorter than that SEE ALSO list would have you believe. let's get into it 🫶

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✨ NAME ✨

drm_detect_hdmi_monitor — literally just: does this monitor speak HDMI or not 💅

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🌸 SYNOPSIS 🌸

bool drm_detect_hdmi_monitor (const struct edid *edid );

it returns a bool, it takes one const struct edid *, that's the whole vibe ✨

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🎀 ARGUMENTS 🎀

• edid — the monitor's EDID information. that's the little blob of self-describing data the display hands over so the kernel knows what it's dealing with 👑

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🦋 DESCRIPTION 🦋

so what it actually does: it parses the CEA extension, and it does that according to CEA-861-B. no cap, that's the spec it's following ✨

important heads-up, bestie 🚨 if you're a driver and you've already added the modes parsed from EDID into drm_display_info, do not call this function. use drm_display_info.is_hdmi instead. like, the info is right there already, why would you go ask again 😭

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💜 RETURN 💜

• True — the monitor is HDMI 🎉
• false — it's not HDMI, or it's unknown 🤷‍♀️

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👑 SEE ALSO 👑

the kernel file for all this lives at ./drivers/gpu/drm/drm_edid.c — that's the mothership 🏠

and now, the friend group 💅 (all of these are (9) section pages):

• drm_edid_header_is_valid(9)
• drm_edid_is_valid(9)
• drm_edid_valid(9)
• drm_do_probe_ddc_edid(9)
• drm_edid_override_connector_update(9)
• drm_edid_raw(9)
• drm_edid_alloc(9)
• drm_edid_dup(9)
• drm_edid_free(9)
• drm_probe_ddc(9)
• drm_get_edid(9)
• drm_edid_read_custom(9)
• drm_edid_read_ddc(9)
• drm_edid_read(9)
• drm_edid_get_product_id(9)
• drm_edid_print_product_id(9)
• drm_edid_get_panel_id(9)
• drm_edid_read_base_block(9)
• drm_get_edid_switcheroo(9)
• drm_edid_read_switcheroo(9)
• drm_edid_duplicate(9)
• edid_get_quirks(9)
• drm_match_cea_mode(9)
• drm_display_mode_from_cea_vic(9)
• drm_edid_match(9)
• drm_edid_get_monitor_name(9)
• drm_edid_to_sad(9)
• drm_edid_to_speaker_allocation(9)
• drm_av_sync_delay(9)
• drm_detect_monitor_audio(9)
• drm_default_rgb_quant_range(9)
• drm_edid_connector_update(9)
• drm_edid_connector_add_modes(9)
• drm_connector_update_edid_property(9)
• drm_add_edid_modes(9)
• drm_add_modes_noedid(9)
• drm_hdmi_avi_infoframe_from_display_mode(9)
• drm_hdmi_avi_infoframe_quant_range(9)
• drm_hdmi_vendor_infoframe_from_display_mode(9)
• drm_edid_is_digital(9)

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and that's the whole page, bestie, you ate that 🍓 this one ships out of ./drivers/gpu/drm, stamped October 2026, and it's still filed under drm_detect_hdmi_monitor(9) in the Kernel API Manual. periodt 💅✨