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The library answers several settings with a NULL matrix or abort() rather than an error, so the display service crash-looped (Restart=on-failure) instead of reaching fallback mode: rows above 64, chain_length above 255 (uint8_t binding setter, documented as "no upper limit"), a misspelled hardware_mapping, and parallel 2-3 on a single-output mapping, reachable from the Display form on the default adafruit-hat(-pwm) mapping. #586 only guarded the Pi 5 subset. - src/matrix_support.py holds the rules for every board (Options::Validate ranges, binding integer types, mapping names and outputs from lib/hardware-mapping.c) plus the Pi 5 ones, and is the one source of the API's numeric ranges. - DisplayManager checks them before building options and raises MatrixSettingsRefused, so a hand-edited config falls back with a logged, reported reason. Emulator mode only warns. - The config API refuses them with a 400 naming the setting; combinations are checked against stored values but reported only when the request sets a field involved. - The hardware status file gains "cause" (settings/library/forced). The fallback log and Display banner give the Pi 5 rebuild hint only for a library failure instead of rebuild + gpio_slowdown advice for every failure; one Pi 5 slowdown recommendation (1-3, start at 1). - The Display form offers classic/classic-pi1 and orientation 90/270 and renders any other stored mapping selected with a warning, so an unrelated save no longer rewrites them; the API accepts 90/270. Audit findings F03, F16, F19, F21. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>