dm_test_upd...caps_non_edp(9)

💅 dm_test_upd...caps_non_edp — Kernel API Manual, bestie edition ✨

okay so this is a page from the Kernel API Manual, and the star of the show is dm_test_upd...caps_non_edp(9) — yes the name is a whole mouthful, the kernel abbreviates it, we move on 🫶

---

✨ NAME ✨

dm_test_update_connector_ext_caps_non_edp — a test that checks the early return path for a non-eDP connector when extended caps get updated. That's the whole vibe. It's a test. It returns early. Slay. 💅

---

🌸 SYNOPSIS 🌸

void dm_test_update_connector_ext_caps_non_edp (struct kunit *test );

literally that's it. one function, one argument, void return because we're not giving anything back, we're just verifying, periodt ✨

---

🦋 ARGUMENTS 🦋

• test — The KUnit test context 💖 that's the little test-frame thing it runs inside. that's the whole job.

---

🎀 SEE ALSO 🎀

okay bestie, buckle up, because this list is long and every single one of these is a real kernel symbol with a (9) manpage section — no skipping, we're doing them ALL 🌈

the stream-finding girlies:

• dm_test_find_stream_with_link_returns_match(9)
• dm_test_find_stream_with_link_missing(9)

set_level era (iconic):

• 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)

update_status + get_level squad:

• 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)

registering the backlight device, we love a registration arc:

• dm_test_register_backlight_device_negative_index(9)
• dm_test_register_backlight_device_success(9)

panel power savings, the sysfs show/store chronicles 👑:

• 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)

device index behaviour:

• dm_test_backlight_device_index_matches_second(9)
• dm_test_backlight_device_index_missing_fallback(9)

caps handling:

• 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)

brightness range, the trilogy 🌟:

• dm_test_brightness_range_null_caps(9)
• dm_test_brightness_range_pwm(9)
• dm_test_brightness_range_aux(9)

brightness_to_user, every edge case imaginable:

• 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_to_user_above_max(9)

brightness_from_user, the reverse trip:

• 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_brightness_from_user_midrange(9)
• dm_test_brightness_from_user_with_curve(9)

custom brightness curves, the ~aesthetic~ ones 🎀:

• 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)

zero signals + fill_props:

• 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)

update_connector_ext_caps — aka our main character's whole family 💜:

• dm_test_update_connector_ext_caps_negative_bl_idx(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)

should_create_sysfs, the decision-makers:

• 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)

setup_backlight_device, the final boss lineup 🔥:

• 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)

and the kernel file itself, go read the source bestie, iykyk:

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

---

ngl this page is basically a test-index for the whole amdgpu_dm_backlight_test.c file — if you're looking for the sibling tests, they're all up there ☝️ no cap 💖

---

✿ and that's the page! ✿

source path is ./drivers/gpu/drm/amd/display/..., dated October 2026, and the page signs off as dm_test_upd...caps_non_edp(9) — go forth and run your KUnit tests, bestie, you're gonna do amazing 🦋✨🎀💅