installed-fresh --edp-backlight (needs --present-latch and its chain)
appends -DSNAP_EDP_BACKLIGHT=1 after every other monitor define, adds
the guest boot-arg adreno_backlight=1, and selects
INPUT_AUXKC_DESKTOP_BACKLIGHT (SnapAdreno PROFILE=desktop-backlight).
That collection is not built or pinned yet, so the flag refuses until
KEXT_PROFILE=desktop-backlight tools/build-auxkc-desktop.sh links it
and its two lines are pinned. --edp-backlight-mode adds
adreno_backlight_mode=1. Boot checks compare the AuxKC as for the
other present-path flags. docs/RUNNING.md describes both.
tools/test-edp-backlight.py: the model (PASS), twelve weakened engines
it must reject (all rejected), the opt-in wiring, and with --build /
--kext-reference the identity proofs. On the final code the org2
monitor is 458,552 bytes with the define (200 bytes of headroom; the
probes commit's 216 predates its event-field change), byte-identical
without it. Hardware: not run.