drm_color_lut_check(9)

💅 drm_color_lut_check(9) — the Kernel API Manual, bestie edition 🎀

okay so this is drm_color_lut_check(9), straight out of the kernel API manual, and it's literally the vibe check for your lookup table ✨

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🌸 NAME 🌸

drm_color_lut_check — check validity of lookup table. that's it, that's the whole job, and it does it slayfully 💅

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✨ SYNOPSIS ✨

int drm_color_lut_check (const struct drm_property_blob *lut , u32 tests );

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🫶 ARGUMENTS 🫶

• lut — the property blob containing the LUT we're checking. yes bestie, the actual table, right there in a blob, iconic 🦋
• tests — a bitmask of tests to run. not a single test, a whole bitmask of them, we're doing the full battery 🔥

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💖 DESCRIPTION 💖

so this is the helper that checks whether a userspace-provided lookup table is valid and satisfies the hardware requirements. like, does this table actually make sense, will the hardware be okay with it, all of that 🧚

drivers pass in a bitmask indicating which of the tests in drm_color_lut_tests should be performed — so you pick your lineup of tests, no cap 🌈

it returns 0 on success, and -EINVAL on failure 😭 (as it should, honestly — invalid is invalid).

ngl, -EINVAL is the moment of truth. if you see it, the table did not pass the vibe check 💀

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👑 SEE ALSO 👑

the whole friend group, fr fr — every one of these is linked and every one of them matters 🍓

• overview(9) — kernel file ./drivers/gpu/drm/drm_color_mgmt.c
• drm_color_ctm_s31_32_to_qm_n(9)
• drm_crtc_enable_color_mgmt(9)
• drm_mode_crtc_set_gamma_size(9)
• drm_crtc_supports_legacy_gamma(9)
• drm_crtc_legacy_gamma_set(9)
• drm_mode_gamma_set_ioctl(9)
• drm_mode_gamma_get_ioctl(9)
• drm_get_color_encoding_name(9)
• drm_get_color_range_name(9)
• drm_plane_create_color_properties(9)
• drm_crtc_load_gamma_888(9)
• drm_crtc_load_gamma_565_from_888(9)
• drm_crtc_load_gamma_555_from_888(9)
• drm_crtc_fill_gamma_888(9)
• drm_crtc_fill_gamma_565(9)
• drm_crtc_fill_gamma_555(9)
• drm_crtc_load_palette_8(9)
• drm_crtc_fill_palette_332(9)
• drm_crtc_fill_palette_8(9)
• drm_color_lut32_check(9)

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and that's the page, bestie 💜 it lives in ./drivers/gpu/drm and this particular glow-up is dated October 2026 — go off, kernel docs, periodt 👑✨