dm_test_brig...er_below_min(9)

🌸 dm_test_brig...er_below_min(9) — Kernel API Manual 🌸

okay so bestie, you're looking at the manual page for dm_test_brig...er_below_min(9) (yes the title is truncated with the little dots, that's literally how it's written, no cap) — it's filed under the Kernel API Manual, and it's giving very niche-AMD-display-test energy. Let's get into it 💅

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✨ NAME ✨

dm_test_brightness_to_user_below_min — literally just "Test Brightness to user below min". That's the whole vibe. A KUnit test that checks what happens when brightness gets converted to a user-facing value and it lands below the minimum. Iconic little edge case, honestly 🎀

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🦋 SYNOPSIS 🦋

void dm_test_brightness_to_user_below_min (struct kunit *test );

that's it, that's the whole signature, she's a void function and she takes exactly one thing 🫶

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💖 ARGUMENTS 💖

• test — The KUnit test context. that's the whole job. she just holds the test context for you, and honestly same 🧚

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👑 SEE ALSO 👑

okay so this is the part where the page just absolutely unloads the entire backlight test suite on you, and honestly? we stan a thorough cross-reference list. every single one of these is a (9) kernel-API page, so let's go, in order, no skipping, periodt 🔥

the file itself:

• Kernel file — ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_backlight_test.c (that's where all the lore lives)

the full cast of sibling tests:

• 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_backlight_get_brightness_uses_device_index(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_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)

like… that is the backlight test cinematic universe and you're at the doorway of it. good luck bestie, hydrate before you click through them all 💀

ngl if you were looking for a juicy description of the actual assertions — there aren't any more on this page. what you see is what you get, fr fr. no invented lore, we don't do that here 🙈

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and that's the page!! 🎀 this one was pulled from ./drivers/gpu/drm/amd/display/... , dated October 2026, and it's filed back under dm_test_brig...er_below_min(9) in the Kernel API Manual — so yeah, that's a wrap, go be iconic with your brightness math ✨💅🦋