dm_test_repl...ing_dmub_srv(9)

💅 NAME 💅

dm_test_replay_set_caps_missing_dmub_srv — bestie, this one verifies that missing DMUB gets rejected 🫶

So real quick, this is a page from the Kernel API Manual (yes, the kernel has lore too ✨) and it's all about one lil KUnit test that checks the sad path: what happens when Replay is supported but the DMUB service ghosted us 💀

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🌸 SYNOPSIS 🌸

void dm_test_replay_set_caps_missing_dmub_srv (struct kunit *test );

That's the whole signature, no cap — void in, nothing out, just vibes and a KUnit verdict 👑

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🎀 ARGUMENTS 🎀

• test — the KUnit test context 🧚 this is the lil handle the test framework hands you so the test can do its thing and report back. Basically the group chat the test posts its results in.

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✨ DESCRIPTION ✨

Okay so picture it: the link and the connector both support Replay (iconic, love that for them 🌈) but there's no DMUB service available — like, nobody's home, the service didn't show up to the party 😭

In that exact situation, amdgpu_dm_set_replay_caps should return false.

That's it. That's the test. It's giving "expect the rejection," and honestly the rejection is the whole point — this test is the vibe check that makes sure the code doesn't pretend everything's fine when the DMUB service is literally missing 💅

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🦋 SEE ALSO 🦋

The kernel file lives right here, go read the source bestie:

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

And here's the whole friend group of sibling tests — every single one, in order, no skips 🙈

• dm_test_replay_set_caps_already_supported(9)
• dm_test_replay_set_caps_non_embedded_signal(9)
• dm_test_replay_set_caps_disallowed_by_panel(9)
• dm_test_replay_set_caps_link_not_supported(9)
• dm_test_replay_set_caps_success(9)
• dm_test_replay_link_setup_null_stream(9)
• dm_test_replay_link_setup_null_link(9)
• dm_test_replay_link_setup_null_vrr_params(9)
• dm_test_replay_link_setup_not_supported(9)
• dm_test_replay_link_setup_already_enabled(9)
• dm_test_replay_link_setup_success(9)
• dm_test_replay_set_event_null_stream(9)
• dm_test_replay_set_event_null_link(9)
• dm_test_replay_set_event_feature_disabled(9)
• dm_test_replay_set_event_missing_power_module(9)
• dm_test_replay_set_event_already_set(9)
• dm_test_replay_set_event_already_clear(9)

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Okay that's the whole page, mwah 💋 thanks for reading, this came from ./drivers/gpu/drm/amd/display/... and it's dated October 2026, so mark your calendars bestie — see you in the future, dm_test_repl...ing_dmub_srv(9) out 🎀✨