drm_do_probe_ddc_edid(9)

💅 drm_do_probe_ddc_edid — like, the Kernel API Manual page you didn't know you needed

okay so bestie, gather round 🫶 this is a page from the Kernel API Manual (manual section 9, kernel devs stay winning) and it's all about drm_do_probe_ddc_edid — the little function that goes "hey monitor, who even are you?" over I2C. iconic behavior honestly.

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✨ NAME ✨

drm_do_probe_ddc_edid — get EDID information via I2C 🖥️✨

like. it literally fetches your display's whole self-description. main character function fr.

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🌸 SYNOPSIS 🌸

int drm_do_probe_ddc_edid (void *data , u8 *buf , unsigned int block ,
       size_t len );

yes she takes four arguments and yes she returns an int. copy it exactly, no cap 🎀

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🦋 ARGUMENTS 🦋

• data — the I2C device adapter 💫 it's a void * so, y'know, vibes (iykyk)
• buf — the EDID data buffer that's gonna get filled up 🍓 a u8 *, ready to receive
• block — which 128 byte EDID block to start fetching from 🧚 it's an unsigned int, so like, 128 bytes per block, that's the unit bestie
• len — the EDID data buffer length to fetch 📏 a size_t, so she's spacious

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💜 DESCRIPTION 💜

so what does she do? she tries to fetch EDID information by calling I2C driver functions ✨ that's it, that's the whole job. she asks the I2C driver very nicely and hopes for the best 💖

no extra steps, no hidden lore, just a probe and a prayer.

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🔥 RETURN 🔥

• 0 on success 👑 slay, we got the EDID
• -1 on failure 💀 not slay, no EDID for you

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🌈 SEE ALSO 🌈

okay this is the long part, and the way it is LONG. she has so many friends. Kernel file ./drivers/gpu/drm/drm_edid.c — that's where the family lives 🏠 and here's the whole group chat, in order:

drm_edid_header_is_valid(9), drm_edid_is_valid(9), drm_edid_valid(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_hdmi_monitor(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)

no, I didn't skip any. there are literally that many. ate 💅

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ngl bestie, if you're reading this page you're probably deep in DRM driver land — drink some water, your eyes deserve it 🫶💧

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okay that's the page!! mwah 😘 this one's signed off from ./drivers/gpu/drm and dated October 2026, so like a little time capsule for future you 🎀✨ bye bestie, go read some EDID bytes for me 🦋