The general GPE dispatch runs on acpid's single main-loop thread, which
also serves /scheme/acpi. A blocking _Lxx/_Exx AML method (e.g. spinning
on a PCI/EC condition that never becomes true) freezes the scheme and
deadlocks every ACPI-reading daemon and therefore the whole boot. Linux
avoids this with a dedicated kacpid thread. Until Red Bear has one, gate
the general dispatch behind REDBEAR_ACPI_GPE_DISPATCH=1 (default OFF);
EC + PM1 fixed events stay always-on (bounded and proven).
Red Bear OS
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