dm_test_sca...ling_changed(9)

👑 dm_test_sca...ling_changed(9) — Kernel API Manual moment 💅

okay so this is a page from the Kernel API Manual, and bestie, it's a whole little KUnit vibe. Sit down, grab a matcha 🍓, we're reading it together.

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✨ NAME ✨

dm_test_scaling_state_scaling_changed — the test that literally checks whether a differing scaling mode actually gets detected. That's the whole assignment. That's the plot. 🎀

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🌸 SYNOPSIS 🌸

void dm_test_scaling_state_scaling_changed (struct kunit *test );

no cap, that's the entire signature. one function, one pointer, zero drama 🦋

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💖 ARGUMENTS 💖

• test — the KUnit test context 🧚 that's it, that's the only thing it takes. it's giving "low maintenance, high impact" energy.

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🌈 SEE ALSO 🌈

okay this is the part where the page absolutely ate — there is a Whole Friend Group of related tests and I'm listing every single one of them, no skips, no shortcuts, because we do not leave anyone out of the group chat 😭

The kernel file itself:

• Kernel file
• ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_test.c

The whole squad (all of them, fr fr):

• dm_test_is_idle(9)
• dm_test_wait_for_idle(9)
• dm_test_soft_reset(9)
• dm_test_set_clockgating_state(9)
• dm_test_set_powergating_state(9)
• dm_test_bandwidth_update(9)
• dm_test_crtc_complete_writeback_no_connector(9)
• dm_test_crtc_complete_writeback_not_pending(9)
• dm_test_vblank_get_counter_out_of_range(9)
• dm_test_vblank_get_counter_no_stream(9)
• dm_test_crtc_get_scanoutpos_invalid_crtc(9)
• dm_test_crtc_get_scanoutpos_no_stream(9)
• dm_test_atomic_get_new_state_empty(9)
• dm_test_atomic_get_new_state_match(9)
• dm_test_atomic_destroy_state_no_context(9)
• dm_test_plane_layer_index_cmp_equal(9)
• dm_test_plane_layer_index_cmp_descending(9)
• dm_test_plane_layer_index_cmp_ascending(9)
• dm_test_fill_color_attr_rgb_format(9)
• dm_test_fill_color_attr_bt601_full(9)
• dm_test_fill_color_attr_bt601_limited(9)
• dm_test_fill_color_attr_bt709_full(9)
• dm_test_fill_color_attr_bt709_limited(9)
• dm_test_fill_color_attr_bt2020_full(9)
• dm_test_fill_color_attr_bt2020_limited(9)
• dm_test_fill_color_attr_invalid_encoding(9)
• dm_test_modereset_required_when_inactive_and_modeset(9)
• dm_test_modereset_not_required_when_active_and_modeset(9)
• dm_test_modereset_not_required_when_inactive_without_modeset(9)
• dm_test_scaling_state_same(9)
• dm_test_scaling_state_underscan_enabled(9)
• dm_test_scaling_state_underscan_disabled(9)
• dm_test_scaling_state_underscan_border_changed(9)
• dm_test_multisync_trigger_disabled(9)
• dm_test_multisync_trigger_rising(9)
• dm_test_multisync_trigger_falling(9)
• dm_test_master_stream_highest_refresh(9)
• dm_test_master_stream_defaults_to_first(9)
• dm_test_cp_diff_hdcp_type_change(9)
• dm_test_cp_diff_reenable_mode_changed(9)
• dm_test_cp_diff_reenable_no_change(9)
• dm_test_cp_diff_undesired(9)
• dm_test_cp_diff_desired_mode_changed(9)
• dm_test_cp_diff_desired_no_change(9)
• dm_test_cp_diff_update_hdcp_hotplug(9)
• dm_test_cp_diff_stream_reenabled(9)
• dm_test_cp_diff_s3_undesired_to_enabled(9)
• dm_test_cp_diff_desired_to_enabled(9)
• dm_test_cp_diff_desired_to_undesired(9)
• dm_test_per_frame_master_sync_single_stream(9)
• dm_test_per_frame_master_sync_two_streams(9)
• dm_test_per_frame_master_sync_skips_null_stream(9)
• dm_test_apply_delay_null_sink(9)
• dm_test_apply_delay_zero_wait(9)
• dm_test_apply_delay_nonzero_wait(9)

bestie if you're looking for the scaling-state section of the test suite, you found it. this page is literally its little corner of the internet 🫶

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and that's the whole page, iconic behavior honestly 💜

this one's sourced from ./drivers/gpu/drm/amd/display/... and dated October 2026, and it's filed under dm_test_sca...ling_changed(9) — so like, remember where you found her 🌟 bye bestie, go run your tests 💅✨