STRUCT DRM_MODE_SET(9)

💅 struct drm_mode_set(9) 💅

okay so bestie, this is struct drm_mode_set(9) from the Kernel API Manual, and it is literally the blueprint for new values in a CRTC config change. no cap, let's get into it 🫶

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🦋 NAME 🦋

struct drm_mode_set — new values for a CRTC config change ✨

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🌸 SYNOPSIS 🌸

       struct drm_mode_set {
           struct drm_framebuffer *fb;
           struct drm_crtc *crtc;
           struct drm_display_mode *mode;
           uint32_t x;
           uint32_t y;
           struct drm_connector **connectors;
           size_t num_connectors;
        };

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🎀 Members 🎀

• fb — the framebuffer to use for the new config. it's giving "here's the canvas, bestie" 🎨
• crtc — the CRTC whose configuration we're about to change. main character energy, fr fr 👑
• mode — the mode timings to use. the whole vibe check for the display ⏱️
• x — position of this CRTC relative to fb. yes, the x-coordinate, we love a coordinate 💅
• y — position of this CRTC relative to fb. and the y-coordinate too, because we're thorough like that 🧚
• connectors — array of connectors to drive with this CRTC if possible. lowkey flexible, highkey useful 🔌
• num_connectors — size of the connectors array. literally the count, keeping things accountable 🍓

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🌈 Description 🌈

so this struct represents a modeset configuration for the legacy SETCRTC ioctl, and it's also used internally. it's giving old-school but still showing up to the group chat 😭

atomic drivers instead use drm_atomic_commit. periodt, that's the atomic route 💫

lowkey legacy alert: this is the legacy SETCRTC ioctl situation. atomic drivers are over here using drm_atomic_commit instead. know the difference, bestie 💀

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👀 SEE ALSO 👀

Kernel file ./include/drm/drm_crtc.h — and these iconic little references:

• struct drm_crtc_state(9)
• struct drm_crtc_funcs(9)
• struct drm_crtc(9)
• drmm_crtc_alloc_with_planes(9)
• drm_crtc_index(9)
• drm_crtc_mask(9)
• drm_crtc_find(9)
• drm_for_each_crtc(9)
• drm_for_each_crtc_reverse(9)

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and that's the page, bestie 💖 signed off from ./include/drm, dated October 2026, in the Kernel API Manual — struct drm_mode_set(9) out! 🎀✨