OUTPUT PROBING HELPER OVERVIEW(9)

✨ output probing helper overview ✨

okay bestie, welcome to the Kernel API Manual entry for the output probing helper overview — this is the lil library that does the behind-the-scenes glow-up for output probing, and it's genuinely so useful 💅

So here's the tea 🍵 — this library hands you some helper code for output probing. Specifically, it gives you an implementation of the core drm_connector_funcs.fill_modes interface, partnering it up with drm_helper_probe_single_connector_modes. iconic behavior, no cap.

It also comes through with support for polling connectors using a work item, plus generic hotplug interrupt handling for when the driver doesn't — or straight up cannot — keep track of a per-connector hpd interrupt. like, we've all been there 🫶

The best part? This helper library can be used independently of the modeset helper library. and drivers can also overwrite different parts — for example, using their own hotplug handling code so they avoid probing unrelated outputs. main character customization energy fr fr 🌸

Also important: the probe helpers share the function table structures with other display helper libraries. peek at struct drm_connector_helper_funcs for all the deets 👑

🔍 SEE ALSO 🔍

Kernel file ./drivers/gpu/drm/drm_probe_helper.c — go read it, it's giving source of truth 💖

• drm_kms_helper_poll_enable(9)
• drm_kms_helper_poll_reschedule(9)
• drm_helper_probe_detect(9)
• drm_helper_probe_single_connector_modes(9)
• drm_kms_helper_hotplug_event(9)
• drm_kms_helper_connector_hotplug_event(9)
• drm_kms_helper_is_poll_worker(9)
• drm_kms_helper_poll_disable(9)
• drm_kms_helper_poll_init(9)
• drm_kms_helper_poll_fini(9)
• drmm_kms_helper_poll_init(9)
• drm_connector_helper_hpd_irq_event(9)
• drm_helper_hpd_irq_event(9)
• drm_crtc_helper_mode_valid_fixed(9)
• drm_connector_helper_get_modes_fixed(9)
• drm_connector_helper_get_modes(9)
• drm_connector_helper_tv_get_modes(9)
• drm_connector_helper_detect_from_ddc(9)

and that's the whole vibe check, bestie 🦋 this page lives in ./drivers/gpu/drm, dated October 2026, and it's from the Kernel API Manual — mwah, slay, periodt 💜🎀