[erykwieliczko]

Problem

DP/HDMI audio is off unless appledrm.hdmi_audio=1 is set, so a distribution that wants it has to ship that option in a modprobe.d file (omarchy-mac-pkgs#83).

Fix

Default hdmi_audio to on and keep the parameter as the opt-out: appledrm.hdmi_audio=0 on the kernel command line, or options appledrm hdmi_audio=0 in modprobe.d before the driver loads. The parameter description no longer says "unstable".

The default applies to every machine the driver supports, M1 and M2 included.

Independent of #297 (no shared files); it applies cleanly with or without it.

Testing

• J514S (M3 Pro): this is the configuration it has run with since the reinstall (hdmi_audio=1 through modprobe.d), HDMI port and USB-C, with drm/apple: hold the audio link on the Type-C ports too #297's hold. This head itself was not booted, since the only change is the parameter's initial value.
• check-commits.py and checkpatch.pl --strict: clean.

🤖 Generated with Claude Code

[chriskearney]

Reviewed exact head c9e5b25. Source passes: hdmi_audio now initializes to true; the existing bool parameter, name and permissions remain unchanged. The other changes are comments/description. Firmware, DT, DMA and model-admission gates are untouched, and the change is disjoint from #295/#297.

CI run 41137945169 passed compile, KUnit, host tests, package and QEMU boot. That PR build merges this head onto 919b433; it does not contain #295/#297. Normal current-base merge-queue CI remains required. The compiled-default and opt-out runtime proofs are still separate release checks, not claimed here.

Release ordering: with audio enabled and the shipped UCM lacking the apple_dcp profile, our J516S boot snapshots selected the DCP generic stereo sink as the default with HDMI disconnected on both boots. This can route normal playback away from the speakers; its priority-versus-saved-state cause is not established. The jack-aware UCM profile from omarchy-pkgs#1889 must therefore deploy before or with any released kernel package carrying this default. One clean sample must not erase those two observations. This is a kernel-package release condition, not a blocker to this integration merge.

The off switch remains appledrm.hdmi_audio=0, or options appledrm hdmi_audio=0 available before module loading (rebuild an early boot image after configuration changes). A runtime write does not remove an already-created card. Existing unsupported-firmware warnings remain unchanged. No all-board playback or full-stack packaging qualification is implied by this approval.

[erykwieliczko]

The jack-aware UCM profile from omarchy-pkgs#1889 must therefore deploy before or with any released kernel package carrying this default

You're hallucinating, 1889 simply changes default from "disabled" to "enabled".