dm_test_unre..._non_dp_noop(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dm_test_unregister_non_dp_noop — Kernel API Manual 💅

okay so bestie, welcome to the <pink>dm_test_unregister_non_dp_noop(9)</pink> page — yes the title got squished by the terminal, it's fine, we're fine, everything's fine 💖. It's a KUnit test and it's lowkey the chillest one in the whole file. Let's get into it.

✨ NAME ✨

dm_test_unregister_non_dp_noop — Test unregister tolerates an unregistered connector 🫶

Like, the whole point is "what happens if we try to unregister something that was never registered?" and the answer is <green>nothing bad, babes</green>. Periodt.

🌸 SYNOPSIS 🌸

void dm_test_unregister_non_dp_noop (struct kunit *test );

That's it. That's the whole signature. No return value, no drama, main character energy but make it void.

🎀 ARGUMENTS 🎀

  • test — The KUnit test context 💅 (the little test-world the framework hands you so the test can actually exist, yk?)

🦋 DESCRIPTION 🦋

okay so picture this 🎬 — no sysfs group was ever created, the CEC notifier is NULL, and the DP AUX channel was never registered. Literally none of the setup happened. Zero. Nada.

And despite all of that <purple>nothing was ever set up</purple>, the unregister call still has to be a safe no-op. Not a crash, not a splat, not a "whoops we dereferenced NULL" moment — just a clean little nothing. 🧚

The way that unregister just has to politely do nothing and not make it weird? Obsessed. That's the entire vibe check this test is running. ✨

💖 SEE ALSO 💖

📁 Kernel file

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

🌈 The rest of the squad (yes, all of them, I would never skip one)

🫶 subconnector + content type crew

🎨 adjust colour depth era

🌸 output color space (the long one, stay with me)

🧮 convert color depth / color_depth_from_info

🔌 to connector type

🪞 duplicate mode, encoder crtc masks, aspect ratio

⏱️ crtc timing decisions

🔄 funcs reset, atomic dup, hdr

⚙️ set_property gang

🪄 get_property gang

🔥 highest refresh + freesync video mode

👑 cacp caps, part one

🖥️ set panel type, part one

🔗 update subconnector (this page's cousin 🫶)

🗜️ fbc init + detect mst

🔍 find first crtc

🖥️ set panel type, part two

👑 cacp caps, part two

🌊 fill stream (big mood)

🧚 create stream

👀 detect

🍓 poll dac, late register, destroy, encoder disable

✅ atomic check

📺 hdmi cec + edid mgmt

🧭 to encoder + native mode

🧩 common modes / ddc / freesync modes

🧵 i2c / vsdb / displayid

🚦 mode valid / cec / s3

🌈 create validate / update after detect / update scaling (final stretch bestie)

ngl if you read that whole SEE ALSO list you're literally unstoppable 💀. Go drink some water, you earned it. 🍓

and that's the page!! this little cutie lives in the source tree at <lavender>./drivers/gpu/drm/amd/display/...</lavender> and it's dated October 2026 🌸 — that's the whole sign-off bestie, ily, go run your tests 🫶✨💖

📦 where this page comes from