dm_test_upda...lor_mgmt_ctm(9)

💅 dm_test_upda...lor_mgmt_ctm 💅

okay so bestie, welcome to the Kernel API Manual — yes, this is a real page from the dm_test_upda...lor_mgmt_ctm(9) section and no, the title isn't actually drunk, the man page renderer just ran out of room and gave us the ol' ... treatment 💀

---

✨ NAME ✨

dm_test_update_crtc_color_mgmt_ctm — the CRTC CTM enables stream gamut remap test. that's the whole vibe. it's a KUnit test that checks the CTM (color transform matrix, iykyk) on the CRTC actually turns on that stream gamut remap glow-up 🌈

---

🎀 SYNOPSIS 🎀

void dm_test_update_crtc_color_mgmt_ctm (struct kunit *test );

literally just one function, one arg, returns nothing. clean. minimal. main character energy 👑

---

🌸 ARGUMENTS 🌸

• test — the KUnit test context, bestie. it's the little ✨house✨ the test lives in. pass it in, let the framework do its thing, don't overthink it 🫶

---

🦋 SEE ALSO 🦋

okay this is the part where the page absolutely ATE and left no crumbs — it's a whole friend group of related tests and fixtures, so let me introduce everyone 💖

the kernel file itself:

./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_color_test.c

that's the source of truth, the mothership, the blueprint 🏠

LUT blob & LUT size verification squad:

• dm_test_make_lut_blob(9)
• dm_test_verify_lut_sizes_null_luts(9)
• dm_test_verify_lut_sizes_valid_degamma(9)
• dm_test_verify_lut_sizes_invalid_degamma(9)
• dm_test_verify_lut_sizes_valid_gamma_atomic(9)
• dm_test_verify_lut_sizes_valid_gamma_legacy(9)
• dm_test_verify_lut_sizes_invalid_gamma(9)
• dm_test_verify_lut_sizes_both_valid(9)
• dm_test_verify_lut_sizes_invalid_degamma_valid_gamma(9)

atomic LUT3D crew:

• dm_test_atomic_lut3d_zero_size(9)
• dm_test_atomic_lut3d_nonzero_state_bits(9)
• dm_test_atomic_lut3d_data_forwarded(9)

colorop 3dlut setters:

• dm_test_set_colorop_3dlut_zero_size(9)
• dm_test_set_colorop_3dlut_nonzero_state_bits(9)
• dm_test_set_colorop_3dlut_data_forwarded(9)

transfer function besties:

• dm_test_set_tf_bypass(9)
• dm_test_set_tf_distributed_points_srgb(9)
• dm_test_set_tf_distributed_points_pq(9)
• dm_test_set_legacy_tf_identity(9)
• dm_test_set_output_tf_linear(9)
• dm_test_set_output_tf_32_srgb_rom(9)
• dm_test_set_input_tf_srgb(9)
• dm_test_set_input_tf_32_srgb(9)
• dm_test_set_transfer_funcs_with_luts(9)

regamma + shaper/blend LUT era:

• dm_test_set_atomic_regamma_bypass(9)
• dm_test_set_atomic_regamma_srgb(9)
• dm_test_atomic_shaper_lut_bypass(9)
• dm_test_atomic_blend_lut_bypass(9)
• dm_test_atomic_shaper_blend_srgb(9)

colorop input TF 1D curve situations:

• dm_test_set_colorop_in_tf_1d_curve_invalid_type(9)
• dm_test_set_colorop_in_tf_1d_curve_unsupported_curve(9)
• dm_test_set_colorop_in_tf_1d_curve_bypass(9)

setup / init:

• dm_test_init_color_mod(9)

LUT3D verification gang:

• dm_test_verify_lut3d_alloc_plane(9)
• dm_test_verify_lut3d_alloc_adev(9)
• dm_test_verify_lut3d_no_luts(9)
• dm_test_verify_lut3d_bad_shaper(9)
• dm_test_verify_lut3d_bad_lut3d(9)
• dm_test_verify_lut3d_valid(9)

fixtures & colorop tests:

• struct dm_test_colorop_fixture(9)
• dm_test_colorop_setup(9)
• dm_test_colorop_multiplier_applied(9)
• dm_test_colorop_multiplier_no_match(9)
• dm_test_colorop_3x4_matrix_applied(9)
• dm_test_colorop_3x4_matrix_bad_length(9)
• dm_test_colorop_degamma_predefined(9)
• dm_test_colorop_degamma_no_match(9)

more fixtures & CRTC color mgmt checks:

• struct dm_test_color_update_fixture(9)
• dm_test_color_update_setup(9)
• dm_test_make_ctm_blob(9)
• dm_test_check_crtc_color_mgmt_no_luts(9)
• dm_test_check_crtc_color_mgmt_legacy_regamma(9)
• dm_test_check_crtc_color_mgmt_degamma(9)
• dm_test_update_crtc_color_mgmt_no_ctm(9)

plane color mgmt tests (the whole extended universe):

• dm_test_update_plane_color_mgmt_bad_lut3d(9)
• dm_test_update_plane_color_mgmt_fallback_defaults(9)
• dm_test_update_plane_color_mgmt_maps_crtc_degamma(9)
• dm_test_update_plane_color_mgmt_maps_crtc_degamma_lut(9)
• dm_test_update_plane_color_mgmt_maps_bt709_degamma(9)
• dm_test_update_plane_color_mgmt_plane_degamma_lut(9)
• dm_test_update_plane_color_mgmt_rejects_dual_degamma(9)
• dm_test_update_plane_color_mgmt_uses_color_caps(9)
• dm_test_update_plane_color_mgmt_legacy_luts(9)
• dm_test_update_plane_color_mgmt_plane_ctm(9)

colorop pipeline crew:

• dm_test_colorop_pipeline_add(9)
• dm_test_colorop_pipeline_setup(9)

plane color mgmt × colorop crossover episodes:

• dm_test_update_plane_color_mgmt_colorop_bypass_pipeline(9)
• dm_test_update_plane_color_mgmt_colorop_missing_multiplier(9)
• dm_test_update_plane_color_mgmt_colorop_missing_3x4(9)
• dm_test_update_plane_color_mgmt_colorop_truncated(9)
• dm_test_update_plane_color_mgmt_colorop_no_3dlut_hw(9)
• dm_test_update_plane_color_mgmt_colorop_shaper(9)
• dm_test_update_plane_color_mgmt_colorop_3dlut(9)
• dm_test_update_plane_color_mgmt_colorop_3dlut_no_data(9)
• dm_test_update_plane_color_mgmt_colorop_blend(9)

like, that's seventy-five references. the author said "you WILL know the whole test suite" and honestly? obsessed 😭💜

---

ngl bestie, this page is short and sweet — one function, one arg, one giant friend list. no environment variables, no exit statuses, no warnings hiding in here. that's the whole tea ☕

---

and that's a wrap, babe 🎀 this cutie came from ./drivers/gpu/drm/amd/display/... and it's dated October 2026 — so go forth, run that KUnit test, and let the CRTC CTM gamut remap slay ✨💅🦋