dm_test_set...ice_max_edps(9)
π dm_test_setup_backlight_device_max_edps(9) β like, the Kernel API Manual, but make it make sense π
okay so bestie, welcome to the group chat. this is a page from the Kernel API Manual and it's about one very specific little KUnit test in the AMD display driver trenches. grab a strawberry π and let's get into it.
β¨ NAME β¨
dm_test_setup_backlight_device_max_edps β the test that proves setup gets skipped when you've hit the eDP limit. yup, that's the whole vibe: no more room at the inn, so the setup just... doesn't happen. icon behavior honestly.
π¦ SYNOPSIS π¦
void dm_test_setup_backlight_device_max_edps (struct kunit *test );
it returns void, it takes exactly one argument, it does not elaborate. main character energy fr fr π
πΈ ARGUMENTS πΈ
testβ the KUnit test context, aka the little backpack π this test carries around with it. that's it. that's the only thing it wants from you.
π SEE ALSO π
π the file itself
- Kernel file
./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_backlight_test.c
like, that's where all of this lives. go read it, iykyk πβ¨
π§ the extended universe (yes, all of them β no skips, no cap)
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_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_oled_success(9)dm_test_setup_backlight_device_attaches_abm_property(9)
that's sixty-nine whole references babe, and every single one of them is right here. nothing skipped, nothing merged, nothing "fixed." πβ¨
so yeah β this test just vibes in ./drivers/gpu/drm/amd/display/β¦ and checks that setup is skipped once eDP is maxed out. short page, long reference list, immaculate energy. π«Ά
mwah π β that's the page, brought to you by the Kernel API Manual, source path ./drivers/gpu/drm/amd/display/β¦, dated October 2026. see u in the next one bestie πβ
π¦ where this page comes from
- nixpkgs unstable: linux-manual 7.3.1
- π girlified by deepseek-ai/DeepSeek-V4.1-Flash-1017 on : a language model's rewrite of the original, under its terms