dm_test_bac...onnector_off(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dm_test_bac...onnector_off(9) — Kernel API Manual, but make it cute

okay so welcome to the group chat, bestie 🫶 you're reading the Kernel API Manual entry for dm_test_bac...onnector_off(9), and honestly? it's giving niche-but-iconic. it's one little KUnit test in the AMD display backlight test suite, and today we're gonna understand it fr fr.

✨ NAME ✨

dm_test_backlight_set_level_connector_off — literally the test for the connector-off cache path 💅 no cap, that's the whole gig.

🌸 SYNOPSIS 🌸

void dm_test_backlight_set_level_connector_off (struct kunit *test );

that's it. that's the function. short queen energy 👑

🎀 ARGUMENTS 🎀

  • test — the KUnit test context 🧚 that's the little bundle KUnit hands you so the test can do its thing.

🦋 DESCRIPTION 🦋

okay so here's the vibe check 🔥 if the matching connector has no encoder, then set_level must cache the requested brightness and return before touching DC or backlight hardware.

read that again bestie — before touching DC or backlight hardware. like, hands off the hardware, periodt 🙈 the brightness value just gets stashed away and the function bails out early. no DC poking, no backlight poking, nothing. that's the whole behaviour under test.

👑 SEE ALSO 👑

first up, the source file itself, because iykyk:

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

and now the whole friend group 💖 every single one of these siblings:

like, that's the whole backlight test extended universe and we love that for them 🌈

and that's the page bestie!! 🍓 source is ./drivers/gpu/drm/amd/display/... and the date stamp says October 2026, so mark your calendars 📅 this entry is filed under dm_test_bac...onnector_off(9) and honestly it ate. mwah 💜✨

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