dm_mst_test...w_sink_count(9)

📦 version 7.3.1, in nixpkgs unstable

💅 dm_mst_test_needs_dsc_aux_workaround_low_sink_count 💅

okay so bestie, welcome to the Kernel API Manual 🎀 — today's main character is dm_mst_test_needs_dsc_aux_workaround_low_sink_count(9), and honestly? she's a little test with a big job. let's get into it ✨

🌸 NAME 🌸

dm_mst_test_needs_dsc_aux_workaround_low_sink_count — literally just here to test that a workaround gets skipped for a single sink. no cap. 🦋

✨ SYNOPSIS ✨

void dm_mst_test_needs_dsc_aux_workaround_low_sink_count (struct kunit
test );

that's it, that's the whole signature 💅

🎀 ARGUMENTS 🎀

  • test — the KUnit test context, aka the little vibe-check object the test framework hands you so you know where to report things. 🫶

💖 DESCRIPTION 💖

mkay so here's the tea 🔥: this test verifies that needs_dsc_aux_workaround returns false when the sink count is less than 2. and yes — even if the device ID and the DPCD rev match. like, those can be a perfect match and it still says nope, because one sink is not two, bestie. the low sink count is giving "not today" and honestly it ate. 💅

so like, false is the whole point here. if that function is out here returning true with a single sink, this test is going to notice and you are going to hear about it 😭

👑 SEE ALSO 👑

if you're obsessed with this one (and why wouldn't you be), the whole friend group lives in the kernel file over at:

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

and here's the entire group chat, besties fr fr 🌈:

like, that's a whole squad 🫶 go say hi.

💀 real talk though: this page lives under ./drivers/gpu/drm/amd/display/... and it's dated October 2026, so if you're reading this from the future — hi, hope the tests pass 🧚

and that's the whole page bestie, mwah 💖 slay, dm_mst_test...w_sink_count(9) out 🎀✨

📦 where this page comes from