Record the two concrete prerequisites for compositor input wiring, found by
reading the compositor source: (1) an event-loop restructure — it uses a
blocking accept loop, drains keys only reactively, and ClientState stores no
UnixStream, so no input source can push wl_keyboard to a client; (2) the
desktop cannot run without DRM/Mesa (no /scheme/drm/card0 on mini), so the
wiring is unvalidatable until the Mesa EGL/DRI port lands. Defines the exact
wiring for when those clear (read /scheme/evdev, set_vt_mode, real XKB keymap
fd, keycode = evdev - 8).
P0 green (acpid compiles). Fresh redbear-mini boot confirms: no console
regression (login + shell command execution intact) and the raw tap is live
(evdevd reads consumer_raw, evdev scheme functional). Boot-log errors observed
are pre-existing and unrelated to the input stack.
Record what landed (S1 raw evdev tap, S4-core VT graphics-mode op, S5 seatd
local package; all compile-checked, boot-validation P0-gated) and correct the
Defect-3 framing: fbcond is a byte-queue + CR/LF + special-key escapes, not a
second canonical line discipline (ptyd is the only one), and the console login
works — so the old "collapse two disciplines" console surgery is deferred as
unnecessary and risky. Grab arbitration + compositor wiring remain gated on the
Mesa desktop bring-up.
Cross-referenced the console-input path against Linux/CachyOS
(local/reference/linux-7.1/drivers/{input,tty}/). Linux applies the
keymap once (vt/keyboard.c) and runs one line discipline (n_tty.c)
shared by the console tty and ptys; RedBear duplicates the keymap
(inputd + fbcond) and CR/LF (fbcond + ptyd) and runs two disciplines
bridged by getty — which is where typed characters are lost (echoed but
not executed). Plan: inputd owns the keymap and emits the full byte
stream (incl. escape sequences); fbcond becomes display-only passthrough
(no keymap, no CR/LF, no cooking); ptyd is the sole line discipline.
Staged, each stage independently bootable; validation needs the build
green (acpi-rs currently blocks it).
vasilito