dm_test_proc...nknown_error(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dm_test_proc...nknown_error — from the Kernel API Manual ✨

okay so bestie, buckle up — this is a page straight out of the Kernel API Manual, and it's about one very specific little KUnit test. she's niche, she's focused, she knows exactly what she's about 🎀

🌸 NAME 🌸

dm_test_process_dmub_set_config_sync_unknown_error — the test that checks SET_CONFIG finishes up with an unknown error. yep, that's the whole vibe. 💀

✨ SYNOPSIS ✨

void dm_test_process_dmub_set_config_sync_unknown_error (struct kunit
       *test );

literally just the one function, one arg, no notes. 🫶

🦋 ARGUMENTS 🦋

  • test — the KUnit test context. that's it, that's the arg. she's carrying the whole test on her shoulders 💖

👑 DESCRIPTION 👑

so here's the tea ☕ — when there's no DC DMUB service around, dc_process_dmub_set_config_async can't reach the firmware at all. and instead of just ghosting, it reports the command as completed with SET_CONFIG_UNKNOWN_ERROR.

which means amdgpu_dm_process_dmub_set_config_sync comes back with 0 and that status. no cap, that's the expected behavior — the test is literally checking that this is what happens. 🔥

🌈 SEE ALSO 🌈

first up, the kernel file this whole thing lives in 👇

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

and now the full friend group — every single one of these is invited to the party 🎉 (i'm not skipping a single one, bestie, we don't do that here):

🫶 quick heads up bestie: all of the above are the sibling test functions — same family, different drama. go read them if you want the full lore. iykyk 💜

and that's the page!! 🌸 this little cutie came from ./drivers/gpu/drm/amd/display/... and she's dated October 2026 — mark your calendars, she's a whole era 💅✨ mwah, bye bestie! 🎀

📦 where this page comes from