dm_test_fill..._alpha_dcn42(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dm_test_fill_blending_global_alpha_dcn42(9) — Kernel API Manual ✨

okay so bestie, welcome to the group chat for this one very specific KUnit test 🎀 it lives in the Kernel API Manual, and it's here to make sure DCN 4.2 doesn't fumble the alpha math. sit down, hydrate, let's go 🦋

🌸 NAME 🌸

dm_test_fill_blending_global_alpha_dcn42 — lowkey the vibe check for DCN 4.2 alpha scaling 💖 no cap, that's literally the whole job.

✨ SYNOPSIS ✨

void dm_test_fill_blending_global_alpha_dcn42 (struct kunit *test );

like, that's it. one function. one parameter. main character energy 👑

🫶 ARGUMENTS 🫶

  • test — the KUnit test context. it's the little backstage pass that tells the test framework "hey bestie, this is my test, here's my stuff" 🎟️

🔥 DESCRIPTION 🔥

okay so the whole point of this test: it verifies whether DCN 4.2 scales the 16-bit DRM alpha down by 4 bits instead of 8 💀

that's it. that's the test. it's giving "small number, huge consequences" — 4 vs 8 is the entire plotline and honestly the way that one detail changes everything?? obsessed 🌈

fr fr, if you're reading this expecting drama, the drama is the bit-shift count. 4 bits, not 8. periodt 💅

👑 SEE ALSO 👑

the Kernel file it chills in, first of all:

  • ./drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_plane_test.c

and then, bestie, here's the whole extended friend group — every single one of these has a (9) and they're all in the same lore universe 🧚:

and that's the tea ☕ from ./drivers/gpu/drm/amd/display/..., dated October 2026, page dm_test_fill..._alpha_dcn42(9) — ily, go read the other 73 pages, mwah 💜🫶✨

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