dm_test_dmub...w_init_fails(9)

💅 dm_test_dmub_hw_init_hw_init_fails(9) — from the Kernel API Manual, bestie 🎀

okay so this is a page out of the Kernel API Manual, and it's all about one little KUnit test. pull up a chair, we're getting into it ✨

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🦋 NAME 🦋

dm_test_dmub_hw_init_hw_init_fails — literally the test that checks hw init hands back -EINVAL when DMUB init goes sideways 💀

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🌸 SYNOPSIS 🌸

void dm_test_dmub_hw_init_hw_init_fails (struct kunit *test );

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💖 ARGUMENTS 💖

• test — the KUnit test context, aka the little vibe-holder that carries the test's state. no notes, she's just doing her job 🫶

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✨ DESCRIPTION ✨

so here's the tea ☕: if the framebuffer-info window count comes in below the required total, then dmub_srv_hw_init is gonna straight-up reject the whole request. no hesitation, no second chances, blocked. 🙅‍♀️

and because of that, dm_dmub_hw_init logs it and returns -EINVAL. iconic behavior, honestly. the test is just here to confirm that's exactly what happens 👑

⚠️ heads up bestie: that rejection path emits a one-time WARN via ASSERT. so yes, you will see it, and no, it's not a bug in your setup — it's the expected drama 😭

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🔥 SEE ALSO 🔥

the whole friend group, in order, no one left out 💜

• Kernel file ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_dmub_test.c
• dm_test_register_dmub_notify_callback_null_callback(9)
• dm_test_register_dmub_notify_callback_type_out_of_range(9)
• dm_test_register_dmub_notify_callback_valid(9)
• dm_test_register_dmub_notify_callback_offload_false(9)
• dm_test_dmub_aux_setconfig_callback_copies_and_completes(9)
• dm_test_dmub_aux_setconfig_callback_non_aux_no_complete(9)
• dm_test_dmub_aux_setconfig_callback_aux_with_null_dm_notify(9)
• dm_test_dmub_aux_setconfig_callback_set_config_reply(9)
• dm_test_dmub_aux_fused_io_callback_copies_reply_and_completes(9)
• dm_test_dmub_aux_fused_io_callback_max_ddc_line(9)
• dm_test_dmub_aux_fused_io_callback_null_args(9)
• dm_test_get_default_ips_mode_dcn35(9)
• dm_test_get_default_ips_mode_dcn351(9)
• dm_test_get_default_ips_mode_dcn36(9)
• dm_test_get_default_ips_mode_older_than_dcn35(9)
• dm_test_get_default_ips_mode_newer_default(9)
• dm_test_dmub_hw_init_no_dmub_srv(9)
• dm_test_dmub_hw_init_no_fb_info(9)
• dm_test_dmub_hw_init_no_firmware(9)
• dm_test_dmub_hw_init_success_fake_dmub(9)
• dm_test_dmub_hw_init_no_hw_support(9)
• dm_test_dmub_hw_init_bss_data(9)
• dm_test_dmub_hw_init_auto_load_timeout(9)
• dm_test_dmub_hw_init_apu_dpia_dcn35(9)
• dm_test_dmub_hw_init_sanity_checks_dcn31(9)
• dm_test_dmub_hw_init_sanity_checks_dcn314(9)
• dm_test_dmub_hw_init_dmcu_abm(9)
• dm_test_dmub_hw_resume_no_dmub_srv(9)
• dm_test_dmub_hw_resume_initialized_dmub(9)
• dm_test_dmub_hw_resume_full_init(9)
• dm_test_dmub_hw_resume_init_check_failed(9)
• dm_test_dmub_hw_resume_auto_load_timeout(9)
• dm_test_dmub_sw_init_unsupported_asic(9)
• dm_test_init_microcode_unsupported_asic(9)
• dm_test_dmub_get_vbios_bounding_box_default_null(9)
• dm_test_execute_dmub_cmd_null_dmub_srv(9)
• dm_test_process_dmub_aux_transfer_sync_engine_acquire(9)
• dm_test_process_dmub_aux_transfer_sync_protocol_error(9)
• dm_test_process_dmub_aux_transfer_sync_copies_data(9)
• dm_test_process_dmub_aux_transfer_sync_zero_length(9)
• dm_test_process_dmub_set_config_sync_unknown_error(9)
• dm_test_abort_fused_io_no_dmub_srv(9)

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and that's the whole page, bestie 💅 sourced from ./drivers/gpu/drm/amd/display/... and dated October 2026 — go forth and let your hw init fail correctly 🧚‍♀️💖