dm_test_get_...isabled_zero(9)

💅 dm_test_get_property_abm_disabled_zero — Kernel API Manual, section 9

okay bestie, welcome to the little corner of the kernel docs that lives in the Kernel API Manual (that's manual 9, iykyk) and is literally all about one tiny ABM test. yes, the title up top is all abbreviated and mysterious, but the real name in the NAME section is the whole thing. let's get into it 🫶

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✨ NAME ✨

dm_test_get_property_abm_disabled_zero — Test get abm returns 0 when disabled

like, that's the whole plot. the test checks that when ABM is disabled, the getter hands you back a zero. slay 💅

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🌸 SYNOPSIS 🌸

void dm_test_get_property_abm_disabled_zero (struct kunit *test );

that's it, that's the signature. void, one arg, no cap. ✨

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🎀 ARGUMENTS 🎀

• test — The KUnit test context 💖 this is the little bundle of test-y goodness that the KUnit framework passes in so the test can actually do its thing.

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🦋 SEE ALSO 🦋

💾 Kernel file

• ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_connector_test.c

🧚 the whole squad of related tests (yes, all of them, no skipping)

subconnector type besties

• dm_test_subconnector_type_none(9), dm_test_subconnector_type_vga(9), dm_test_subconnector_type_dvi_converter(9), dm_test_subconnector_type_dvi_dongle(9)
• dm_test_subconnector_type_hdmi_converter(9), dm_test_subconnector_type_hdmi_dongle(9), dm_test_subconnector_type_mismatched(9), dm_test_subconnector_type_default_unknown(9)

content type crew

• dm_test_content_type_no_data(9), dm_test_content_type_graphics(9), dm_test_content_type_photo(9), dm_test_content_type_cinema(9)
• dm_test_content_type_game(9), dm_test_content_type_unknown_defaults_no_data(9)

adjust colour depth gang

• dm_test_adjust_colour_depth_fits_at_888(9), dm_test_adjust_colour_depth_reduces_to_888(9), dm_test_adjust_colour_depth_10bpc_passes(9)
• dm_test_adjust_colour_depth_420_halves_clk(9), dm_test_adjust_colour_depth_420_reduces(9), dm_test_adjust_colour_depth_reduces_12bpc_to_10bpc(9)
• dm_test_adjust_colour_depth_16bpc_no_fallback(9), dm_test_adjust_colour_depth_none_fits(9), dm_test_adjust_colour_depth_invalid_depth(9)

output color space icons 👑

• dm_test_output_color_space_default_rgb_full(9), dm_test_output_color_space_default_rgb_limited(9), dm_test_output_color_space_default_ycbcr709(9), dm_test_output_color_space_default_ycbcr601_limited(9)
• dm_test_output_color_space_bt601_y_only(9), dm_test_output_color_space_bt601(9), dm_test_output_color_space_bt709(9), dm_test_output_color_space_bt709_y_only(9)
• dm_test_output_color_space_oprgb(9), dm_test_output_color_space_bt2020_rgb(9), dm_test_output_color_space_bt2020_rgb_limited(9)
• dm_test_output_color_space_default_rgb_auto_hdmi_cta(9), dm_test_output_color_space_default_rgb_auto_hdmi_vga(9), dm_test_output_color_space_default_rgb_auto_dp_cta(9)
• dm_test_output_color_space_default_rgb_full_hdmi_cta(9), dm_test_output_color_space_bt2020_rgb_auto_hdmi_cta(9), dm_test_output_color_space_bt2020_ycc(9)
• dm_test_output_color_space_default_ycbcr709_y_only(9), dm_test_output_color_space_default_ycbcr601(9)
• dm_test_output_color_space_bt2020_ycc_rgb_encoding(9), dm_test_output_color_space_bt2020_ycc_rgb_encoding_limited(9), dm_test_output_color_space_bt2020_rgb_ycc_encoding(9)

color depth converters & friends

• dm_test_convert_color_depth_bpc_mappings(9), dm_test_convert_color_depth_bpc_unknown(9)
• dm_test_color_depth_from_info_bpc8(9), dm_test_color_depth_from_info_bpc10(9), dm_test_color_depth_from_info_zero_bpc_defaults_888(9)
• dm_test_color_depth_from_info_requested_bpc_caps(9), dm_test_color_depth_from_info_y420_default(9), dm_test_color_depth_from_info_y420_10bpc(9)
• dm_test_color_depth_from_info_y420_12bpc(9), dm_test_color_depth_from_info_y420_16bpc(9)
• dm_test_color_depth_from_info_requested_odd_bpc(9), dm_test_color_depth_from_info_unsupported_bpc(9)

connector type translator era 💫

• dm_test_to_connector_type_hdmi(9), dm_test_to_connector_type_edp(9), dm_test_to_connector_type_lvds(9), dm_test_to_connector_type_rgb(9)
• dm_test_to_connector_type_dp(9), dm_test_to_connector_type_dp_mst(9), dm_test_to_connector_type_dvi_dvii(9), dm_test_to_connector_type_dual_link_dvii(9)
• dm_test_to_connector_type_dvi_dvid(9), dm_test_to_connector_type_dual_link_dvid(9), dm_test_to_connector_type_virtual(9), dm_test_to_connector_type_unknown(9)

duplicate mode detectives 🔍

• dm_test_is_duplicate_mode_empty_list(9), dm_test_is_duplicate_mode_match(9), dm_test_is_duplicate_mode_no_match(9), dm_test_is_duplicate_mode_same_size_different_clock(9)

encoder crtc masks (the numbered girlies)

• dm_test_encoder_crtc_mask_1(9), dm_test_encoder_crtc_mask_2(9), dm_test_encoder_crtc_mask_3(9)
• dm_test_encoder_crtc_mask_4(9), dm_test_encoder_crtc_mask_5(9), dm_test_encoder_crtc_mask_6(9), dm_test_encoder_crtc_mask_default(9)

aspect ratio angels

• dm_test_aspect_ratio_no_data(9), dm_test_aspect_ratio_4_3(9), dm_test_aspect_ratio_16_9(9), dm_test_aspect_ratio_64_27(9), dm_test_aspect_ratio_256_135(9)

crtc timing decisions

• dm_test_copy_crtc_timing_copies_all_fields(9), dm_test_copy_crtc_timing_leaves_non_crtc_fields(9)
• dm_test_decide_crtc_timing_scale_enabled(9), dm_test_decide_crtc_timing_matching_mode(9), dm_test_decide_crtc_timing_no_copy(9), dm_test_decide_crtc_timing_no_crtc_clock(9)

funcs reset + atomic dup

• dm_test_funcs_reset_sets_defaults(9), dm_test_funcs_reset_edp_abm_level(9), dm_test_funcs_reset_edp_abm_disabled(9)
• dm_test_atomic_dup_state_copies_fields(9)

hdr filling

• dm_test_fill_hdr_null_metadata(9), dm_test_fill_hdr_zeroes_output(9)

set_property squad 🌈

• dm_test_set_property_scaling_center(9), dm_test_set_property_scaling_aspect(9), dm_test_set_property_scaling_fullscreen(9)
• dm_test_set_property_scaling_none(9), dm_test_set_property_scaling_unchanged(9)
• dm_test_set_property_underscan_hborder(9), dm_test_set_property_underscan_vborder(9), dm_test_set_property_underscan_enable(9)
• dm_test_set_property_abm_sysfs_control(9), dm_test_set_property_abm_level_off(9), dm_test_set_property_abm_level_value(9), dm_test_set_property_unknown(9)

get_property squad (our main character's neighbours 🎀)

• dm_test_get_property_scaling_center(9), dm_test_get_property_scaling_aspect(9), dm_test_get_property_scaling_full(9), dm_test_get_property_scaling_off(9)
• dm_test_get_property_underscan_borders(9), dm_test_get_property_abm_sysfs_allowed(9), dm_test_get_property_abm_level(9), dm_test_get_property_unknown(9)

highest refresh icons

• dm_test_highest_refresh_writeback_null(9), dm_test_highest_refresh_cached_base(9), dm_test_highest_refresh_preferred_mode(9)

freesync video mode

• dm_test_is_freesync_video_mode_null_mode(9), dm_test_is_freesync_video_mode_match(9), dm_test_is_freesync_video_mode_no_match(9)

cacp caps chaos 🌀

• dm_test_cacp_caps_unsupported_ip(9), dm_test_cacp_caps_excluded_ip_316(9), dm_test_cacp_caps_edp_oled_supported(9)
• dm_test_cacp_caps_lvds_oled_supported(9), dm_test_cacp_caps_non_edp_signal(9), dm_test_cacp_caps_lcd_panel(9)
• dm_test_cacp_caps_edp_supported(9), dm_test_cacp_caps_lvds_supported(9), dm_test_cacp_caps_old_ip_unsupported(9)
• dm_test_cacp_caps_ip_3_1_6_unsupported(9), dm_test_cacp_caps_non_edp_lvds_unsupported(9), dm_test_cacp_caps_lcd_unsupported(9)

set panel type posse

• dm_test_set_panel_type_vsdb_oled(9), dm_test_set_panel_type_vsdb_miniled(9), dm_test_set_panel_type_dpcd_oled(9), dm_test_set_panel_type_dpcd_miniled(9)
• dm_test_set_panel_type_did_oled(9), dm_test_set_panel_type_did_lcd(9), dm_test_set_panel_type_vendor_lum_heuristic(9), dm_test_set_panel_type_defaults_to_lcd(9)
• dm_test_set_panel_type_samsung_miniled(9), dm_test_set_panel_type_samsung_below_threshold(9), dm_test_set_panel_type_default_lcd(9)

update subconnector

• dm_test_update_subconnector_dp_with_sink(9), dm_test_update_subconnector_dp_no_sink(9), dm_test_update_subconnector_non_dp_noop(9)

fbc init

• dm_test_fbc_init_no_compressor(9), dm_test_fbc_init_non_edp(9), dm_test_fbc_init_already_allocated(9), dm_test_fbc_init_no_modes(9)

detect mst

• dm_test_detect_mst_no_connectors(9), dm_test_detect_mst_skips_writeback(9), dm_test_detect_mst_non_mst_link(9), dm_test_detect_mst_branch_without_aux(9)

find first crtc

• dm_test_find_first_crtc_match(9), dm_test_find_first_crtc_no_match(9), dm_test_find_first_crtc_empty_state(9)
• dm_test_find_first_crtc_skips_null_ptr(9), dm_test_find_first_crtc_returns_first(9)

fill stream fam

• dm_test_fill_stream_borders_zeroed(9), dm_test_fill_stream_rgb_defaults(9), dm_test_fill_stream_sync_polarity_positive(9), dm_test_fill_stream_sync_polarity_negative(9)
• dm_test_fill_stream_inherits_old_stream(9), dm_test_fill_stream_timing_from_crtc(9), dm_test_fill_stream_color_depth_requested_bpc(9)
• dm_test_fill_stream_content_type(9), dm_test_fill_stream_aspect_ratio(9)
• dm_test_fill_stream_encoding_from_caller_ycbcr420(9), dm_test_fill_stream_encoding_from_caller_ycbcr422(9), dm_test_fill_stream_encoding_from_caller_ycbcr444(9)
• dm_test_fill_stream_hdmi_ep_clamps_depth(9), dm_test_fill_stream_non_hdmi_ep_keeps_depth(9)

create stream crew

• dm_test_create_stream_fake_sink_success(9), dm_test_create_stream_sets_dm_context(9), dm_test_create_stream_virtual_signal(9)
• dm_test_create_stream_scaling_src(9), dm_test_create_stream_existing_sink(9)

detect era

• dm_test_detect_force_on(9), dm_test_detect_force_on_digital(9), dm_test_detect_force_off(9), dm_test_detect_sink_present(9), dm_test_detect_no_sink(9)

misc icons of the connector test file ⭐

• dm_test_poll_dac_load_returns_cached(9), dm_test_late_register_non_dp_succeeds(9), dm_test_unregister_non_dp_noop(9)
• dm_test_destroy_minimal(9), dm_test_destroy_releases_dc_sink(9), dm_test_destroy_releases_dc_em_sink(9)
• dm_test_encoder_disable_noop(9)
• dm_test_atomic_check_edp_native_keeps_scaling(9), dm_test_atomic_check_lvds_non_native_enables_scaling(9), dm_test_atomic_check_non_mst_returns_zero(9)
• dm_test_hdmi_cec_unset_edid_no_notifier(9), dm_test_hdmi_cec_set_edid_no_notifier(9)
• dm_test_create_eml_sink_no_edid(9), dm_test_handle_edid_mgmt_dp_sets_link_caps(9), dm_test_handle_edid_mgmt_non_dp_leaves_caps(9)
• dm_test_funcs_force_no_edid(9)
• dm_test_validate_stream_null_stream(9), dm_test_to_encoder_no_encoder(9), dm_test_to_encoder_returns_attached(9)
• dm_test_native_mode_no_encoder(9), dm_test_native_mode_empty_probed_zeroes_clock(9), dm_test_native_mode_copies_preferred(9)
• dm_test_create_common_mode_overrides(9), dm_test_add_common_modes_non_edp_noop(9), dm_test_add_common_modes_edp_adds(9)
• dm_test_ddc_get_modes_null_edid(9), dm_test_add_fs_modes_no_preferred_mode(9), dm_test_add_freesync_modes_null_edid_noop(9)
• dm_test_i2c_func_returns_flags(9), dm_test_i2c_xfer_no_ddc_pin(9)
• dm_test_get_amd_vsdb_unsupported(9), dm_test_get_amd_vsdb_supported(9)
• dm_test_parse_hdmi_amd_vsdb_null_edid(9), dm_test_parse_hdmi_amd_vsdb_no_extensions(9), dm_test_parse_hdmi_amd_vsdb_no_cea_ext(9)
• dm_test_parse_displayid_vrr_null_edid(9), dm_test_parse_displayid_vrr_no_displayid(9), dm_test_parse_displayid_vrr_sets_range(9)
• dm_test_mode_valid_interlace_rejected(9), dm_test_mode_valid_dblscan_rejected(9)
• dm_test_s3_handle_hdmi_cec_suspend(9), dm_test_s3_handle_hdmi_cec_resume(9)
• dm_test_create_validate_stream_null_dm_state(9)
• dm_test_update_after_detect_mst_noop(9), dm_test_update_after_detect_sink_unchanged(9)
• dm_test_update_scaling_null_mode(9), dm_test_update_scaling_fullscreen_default(9), dm_test_update_scaling_rmx_full(9)
• dm_test_update_scaling_rmx_aspect_pillarbox(9), dm_test_update_scaling_rmx_aspect_letterbox(9), dm_test_update_scaling_rmx_center(9), dm_test_update_scaling_underscan(9)

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ngl bestie, that's a lot of sibling tests. the whole connector test file is basically one big group chat and this page is just one member of it. 💀

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okay that's the page!! 💖 this lil doc came from the source ./drivers/gpu/drm/amd/display/... and it's dated October 2026, living its best life in section 9 of the Kernel API Manual as dm_test_get_...isabled_zero(9). go off, you test file queen 👑✨🦋