dm_test_back...device_index(9)

💅 dm_test_backlight_get_brightness_uses_device_index — Kernel API Manual ✨

okay so bestie, welcome to the Kernel API Manual and lemme tell you about this one little test in the 9 section, dm_test_backlight_get_brightness_uses_device_index 🎀 like the name is a whole mouthful but she's literally just testing the get_brightness wrapper, no cap 🫶

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🌸 NAME 🌸

dm_test_backlight_get_brightness_uses_device_index — a vibe check on the get_brightness wrapper, fr fr 💖

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✨ SYNOPSIS ✨

void dm_test_backlight_get_brightness_uses_device_index (struct kunit
*test );

like that's it. that's the whole signature. she's a void, she takes one thing, she does her little test and dips 👑

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🦋 ARGUMENTS 🦋

• test — the KUnit test context 💅 that's the whole thing, that's who she is, the context she needs to run

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🧚 SEE ALSO 🧚

🌈 Kernel file

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

💜 the whole friend group (yes there are 69 of them, iconic)

• dm_test_find_stream_with_link_returns_match(9)
• dm_test_find_stream_with_link_missing(9)
• dm_test_backlight_set_level_connector_off(9)
• dm_test_backlight_set_level_no_stream(9)
• dm_test_backlight_set_level_aux_programs_power_module(9)
• dm_test_backlight_set_level_pwm_programs_power_module(9)
• dm_test_backlight_set_level_reallows_idle(9)
• dm_test_backlight_update_status_no_stream(9)
• dm_test_backlight_get_level_pwm_success(9)
• dm_test_backlight_get_level_pwm_error(9)
• dm_test_backlight_get_level_aux_success(9)
• dm_test_backlight_get_level_aux_error(9)
• dm_test_register_backlight_device_negative_index(9)
• dm_test_register_backlight_device_success(9)
• dm_test_panel_power_savings_show_maps_disable_to_zero(9)
• dm_test_panel_power_savings_show_reports_level(9)
• dm_test_panel_power_savings_store_sets_disable(9)
• dm_test_panel_power_savings_store_forbidden(9)
• dm_test_panel_power_savings_store_rejects_invalid_text(9)
• dm_test_panel_power_savings_store_rejects_out_of_range(9)
• dm_test_backlight_device_index_matches_second(9)
• dm_test_backlight_device_index_missing_fallback(9)
• dm_test_backlight_caps_valid_short_circuit(9)
• dm_test_backlight_caps_aux_support_noop(9)
• dm_test_backlight_caps_non_aux_sets_defaults(9)
• dm_test_brightness_range_null_caps(9)
• dm_test_brightness_range_pwm(9)
• dm_test_brightness_range_aux(9)
• dm_test_brightness_to_user_null_caps(9)
• dm_test_brightness_to_user_below_min(9)
• dm_test_brightness_to_user_at_max(9)
• dm_test_brightness_to_user_at_min(9)
• dm_test_brightness_to_user_midpoint_pwm(9)
• dm_test_brightness_from_user_null_caps(9)
• dm_test_brightness_from_user_zero(9)
• dm_test_brightness_from_user_max(9)
• dm_test_brightness_from_user_aux(9)
• dm_test_custom_brightness_no_data_points(9)
• dm_test_custom_brightness_debug_mask_disables(9)
• dm_test_custom_brightness_exact_match(9)
• dm_test_custom_brightness_below_first(9)
• dm_test_custom_brightness_interpolation(9)
• dm_test_custom_brightness_above_last(9)
• dm_test_custom_brightness_single_data_point(9)
• dm_test_custom_brightness_lower_lum_zero(9)
• dm_test_brightness_to_user_above_max(9)
• dm_test_brightness_from_user_midrange(9)
• dm_test_brightness_from_user_with_curve(9)
• dm_test_brightness_range_zero_signals(9)
• dm_test_backlight_fill_props_ac_linear(9)
• dm_test_backlight_fill_props_dc_nonlinear(9)
• dm_test_backlight_fill_props_default_range(9)
• dm_test_update_connector_ext_caps_negative_bl_idx(9)
• dm_test_update_connector_ext_caps_non_edp(9)
• dm_test_update_connector_ext_caps_oled_defaults(9)
• dm_test_update_connector_ext_caps_luminance_values(9)
• dm_test_update_connector_ext_caps_force_aux(9)
• dm_test_update_connector_ext_caps_force_pwm(9)
• dm_test_should_create_sysfs_abm_forced(9)
• dm_test_should_create_sysfs_non_edp(9)
• dm_test_should_create_sysfs_no_backlight_index(9)
• dm_test_should_create_sysfs_oled_no_cacp(9)
• dm_test_should_create_sysfs_oled_cacp(9)
• dm_test_should_create_sysfs_lcd_panel(9)
• dm_test_setup_backlight_device_non_edp(9)
• dm_test_setup_backlight_device_connection_none(9)
• dm_test_setup_backlight_device_max_edps(9)
• dm_test_setup_backlight_device_oled_success(9)
• dm_test_setup_backlight_device_attaches_abm_property(9)

bestie that list is LONG and honestly? she ate. every single one of those is a sibling test in the same backlight test family, so if you get one you lowkey get the whole lore 🔥

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🍓 the sign-off 🍓

so yeah, this page came from ./drivers/gpu/drm/amd/display/... and it's dated October 2026 💖 and the manual name for the record is dm_test_back...device_index(9) — okay bye, go read the actual C file, iykyk 😭💅